Leases - Weighted Average Lease Term and Discount Rate (Details) $ in Thousands  | 
6 Months Ended | 
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 Jun. 30, 2019  
USD ($) 
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| Lessee, Lease, Description [Line Items] | |
| Cash paid for amounts included in measurement of operating lease liabilities | $ 3,103 | 
| Cash paid for amounts included in measurement of finance lease liabilities | 940 | 
| Right-of-use-assets obtained in exchange for operating lease obligations | 2,795 | 
| Right-of-use-assets obtained in exchange for finance lease obligations | $ 19,582 | 
| Weighted average remaining lease term -- finance lease | 7 years | 
| Weighted average IBR -- finance lease (as a percent) | 9.85% | 
| Real Estate | |
| Lessee, Lease, Description [Line Items] | |
| Weighted average remaining lease term -- operating leases | 7 years 6 months 11 days | 
| Weighted average IBR - operating lease (as a percent) | 9.57% | 
| Co-Location | |
| Lessee, Lease, Description [Line Items] | |
| Weighted average remaining lease term -- operating leases | 5 years 8 months 12 days | 
| Weighted average IBR - operating lease (as a percent) | 9.07% | 
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- Definition Finance Lease, Payments No definition available. 
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- Definition Weighted average discount rate for finance lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Weighted average discount rate for operating lease calculated at point in time. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition Amount of increase in right-of-use asset obtained in exchange for finance lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Details 
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