Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Jun. 30, 2015
Income Tax Disclosure [Line Items]
Gross deferred tax asset	$ 73,465
Valuation allowance	16,081
Net deferred tax asset	57,384
Deferred tax liabilities, gross	21,644
Net operating loss carryforwards for U.S. federal income tax purposes	167,303
Tax windfall	294
Research and experimentation credit carryforwards	1,337
Alternative minimum tax credit carryforwards	$ 56
AMT percentage	20.00%
Maximum percentage of income offset by available NOLs	90.00%
Net operating loss carryforwards, net of limitations	$ 167,009
Utilization Of Deferred Tax Assets [Member]
Income Tax Disclosure [Line Items]
Future U.S.taxable income	137,000
Utilization Of Deferred Tax Assets [Member] | Before 2022 [Member]
Income Tax Disclosure [Line Items]
Future U.S.taxable income	$ 117,000
Minimum [Member]
Income Tax Disclosure [Line Items]
Foreign statutory tax rate, foreign operations		20.00%
Maximum [Member]
Income Tax Disclosure [Line Items]
Foreign statutory tax rate, foreign operations		35.00%