Annual report pursuant to Section 13 and 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - New Accounting Pronouncements (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Item Effected [Line Items]                      
Goodwill, Impairment Loss $ 64,000,000 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 64,000,000 $ 0 $ 0
Other non-current assets 7,233,000       12,024,000       7,233,000 12,024,000  
Long-term debt $ 468,231,000       70,099,000       $ 468,231,000 70,099,000  
Accounting Standards Update 2015-03                      
Item Effected [Line Items]                      
Other non-current assets         12,024,000         12,024,000  
Long-term debt         70,099,000         70,099,000  
Accounting Standards Update 2015-03 | As Presented                      
Item Effected [Line Items]                      
Other non-current assets         13,702,000         13,702,000  
Long-term debt         71,493,000         71,493,000  
Accounting Standards Update 2015-03 | Reclassification                      
Item Effected [Line Items]                      
Other non-current assets         (1,678,000)         (1,678,000)  
Long-term debt         (1,678,000)         (1,678,000)  
Capital Lease Obligations [Member] | Accounting Standards Update 2015-03 | Reclassification                      
Item Effected [Line Items]                      
Other non-current assets         0         0  
Long-term debt         $ 284,000         $ 284,000