Statement of Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumlated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ (11,688)				$ (11,688)
Total other comprehensive income (loss)	$ (11,833)			$ (9,638)			(32,718)	$ (6,780)
Ending balance	(44,406)						(44,406)
Foreign Currency
Accumlated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(30,710)	$ (32,835)	(9,825)	6,351	$ 3,547	$ 3,493	(9,825)	3,493
Other comprehensive income	(11,833)	2,125	(12,519)	(9,638)	2,804	54
Amounts reclassified from accumulated other comprehensive income			(10,491)
Total other comprehensive income (loss)			(23,010)
Ending balance	(42,543)	(30,710)	(32,835)	(3,287)	6,351	3,547	(42,543)	(3,287)
Defined Benefit Pension Plans
Accumlated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1,863)	(1,863)	(1,863)	(1,066)	(1,066)	(1,066)	(1,863)	(1,066)
Other comprehensive income	0	0	0	0	0	0
Amounts reclassified from accumulated other comprehensive income			0
Total other comprehensive income (loss)			0
Ending balance	(1,863)	(1,863)	(1,863)	(1,066)	(1,066)	(1,066)	(1,863)	(1,066)
Accumulative Other Comprehensive Loss
Accumlated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(32,573)	(34,698)	(11,688)	5,285	2,481	2,427	(11,688)	2,427
Other comprehensive income	(11,833)	2,125	(12,519)	(9,638)	2,804	54
Amounts reclassified from accumulated other comprehensive income			(10,491)
Total other comprehensive income (loss)			(23,010)
Ending balance	(44,406)	$ (32,573)	$ (34,698)	$ (4,353)	$ 5,285	$ 2,481	(44,406)	$ (4,353)
Carrying (Reported) Amount, Fair Value Disclosure | Less unamortized deferred financing fees
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Notes Payable, Fair Value Disclosure	100,000						100,000			$ 100,000
Estimate of Fair Value, Fair Value Disclosure | Less unamortized deferred financing fees
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Notes Payable, Fair Value Disclosure	105,200						$ 105,200		$ 106,800
Out of Period Adjustment Included in Stock Compensation Expense
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Out of period adjustment	1,100
Out of Period Adjustment Included in Stock Compensation Expense, After Tax
Quantifying Misstatement in Current Year Financial Statements [Line Items]
Out of period adjustment	$ 700