Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Narrative) (Details)

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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%