Income Taxes - Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Current:
U.S. federal	$ 1,086us-gaap_CurrentFederalTaxExpenseBenefit	$ 541us-gaap_CurrentFederalTaxExpenseBenefit	$ (579)us-gaap_CurrentFederalTaxExpenseBenefit
U.S. state	100	56	53
Non-U.S.	222us-gaap_CurrentForeignTaxExpenseBenefit	(12)us-gaap_CurrentForeignTaxExpenseBenefit	155us-gaap_CurrentForeignTaxExpenseBenefit
Total current	1,408us-gaap_CurrentIncomeTaxExpenseBenefit	585us-gaap_CurrentIncomeTaxExpenseBenefit	(371)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:
U.S. federal	8,913	(29,552)	177
U.S. state	(558)	(3,370)	17
Non-U.S.	78	252	(49)
Total deferred	8,433us-gaap_DeferredIncomeTaxExpenseBenefit	(32,670)us-gaap_DeferredIncomeTaxExpenseBenefit	145us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (benefit)	$ 9,841us-gaap_IncomeTaxExpenseBenefit	$ (32,085)us-gaap_IncomeTaxExpenseBenefit	$ (226)us-gaap_IncomeTaxExpenseBenefit

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