Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Valuation Allowance [Line Items]          
Income tax provision (benefit) $ 1,323 $ 843 $ 637 $ 2,098  
Valuation allowance 59,900   59,900   $ 73,700
Liability for uncertain tax positions 4,900   4,900    
Liability for uncertain tax positions, interest and penalties accrued 800   800    
Federal          
Valuation Allowance [Line Items]          
Operating loss carryforwards 106,400   106,400   128,400
State and Local          
Valuation Allowance [Line Items]          
Operating loss carryforwards 56,000   56,000   64,800
Domestic Deferred Tax Assets          
Valuation Allowance [Line Items]          
Valuation allowance 57,000   57,000   70,900
Foreign Deferred Tax Assets          
Valuation Allowance [Line Items]          
Valuation allowance $ 2,900   $ 2,900   $ 2,800