Income Taxes - Income Taxes Provision (Benefit) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Federal, current	$ 0us-gaap_CurrentFederalTaxExpenseBenefit	$ (258)us-gaap_CurrentFederalTaxExpenseBenefit	$ (190)us-gaap_CurrentFederalTaxExpenseBenefit
Federal, deferred	(5,608)	222	6,873
Federal, total	(5,608)	(36)	6,683
State, current	6	6	7
State, deferred	853	88	1,653
State, total	859	94	1,660
Foreign, current	2,453us-gaap_CurrentForeignTaxExpenseBenefit	2,022us-gaap_CurrentForeignTaxExpenseBenefit	2,135us-gaap_CurrentForeignTaxExpenseBenefit
Foreign, deferred	1,944	311	(95)
Foreign, total	4,397	2,333	2,040
Valuation allowance	4,698	(239)	(8,034)
Tax provision	$ 4,346us-gaap_IncomeTaxExpenseBenefit	$ 2,152us-gaap_IncomeTaxExpenseBenefit	$ 2,349us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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