Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Beginning Balance	$ (27,141)	$ (2,854)	$ (1,299)
Currency translation adjustments	(32,142)	(20,551)	(6,363)
Changes related to benefit plans, net of income tax expense	721	(3,736)	4,808
Ending Balance	(58,562)	(27,141)	(2,854)
Currency Translation [Member]
Beginning Balance	(25,059)	(4,508)	1,855
Currency translation adjustments	(32,142)	(20,551)	(6,363)
Changes related to benefit plans, net of income tax expense	0	0	0
Ending Balance	(57,201)	(25,059)	(4,508)
Employee Benefit Plans [Member]
Beginning Balance	(2,082)	1,654	(3,154)
Currency translation adjustments	0	0	0
Changes related to benefit plans, net of income tax expense	(721)	3,736	4,808
Ending Balance	$ (1,361)	$ (2,082)	$ 1,654