Income Taxes Income Taxes - Reconciliation between Federal Statutory rate and Income Tax Benefit (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit), Income Tax Reconciliation [Abstract]
Tax benefit at U.S. Federal statutory rate	$ (21,029)	$ (13,880)	$ (13,472)
State income taxes, net of U.S. Federal income tax benefit	214	(1,052)	188
Earnings taxed at rates different than the U.S. Federal statutory rate	(8,188)	(6,051)	(6,271)
Changes in enacted tax rates	346	488	(63)
Change in valuation allowances	18,824	16,722	16,310
Impact of changes in uncertain tax positions	245	(12,179)	386
Unrecognized foreign loss	8,447
Other, net	339	1,191	1,199
Benefit from income taxes	$ (802)	$ (14,761)	$ (1,723)