Nature of Business and Significant Accounting Policies Nature of Business and Significant Accounting Policies (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes from Accumulated Other Comprehensive income [Abstract]
Pension plans, beginning balance	$ (2,378)
Pension plans adjustment, before reclassification	500
Pension plans, reclassification	161
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	533
Pension plans adjustment, after reclassification	661	$ (212)	$ 2,961
Pension plans, ending balalnce	(1,717)	(2,378)
Cash flow hedges, beginning balance	925
Cash flow hedges adjustment, before reclassification	(1,135)
Cash flow hedges, reclassification	0
Cash flow hedges adjustment, after reclassification	(602)	(735)	1,660
Cash flow hedges, ending balance	323	925
Foreign currency translation, beginning balance	(61,956)
Foreign currency translation adjustment	(61,776)	(88,462)	11,838
Foreign currency translation, ending balance	(123,732)	(61,956)
Accumulated other comprehensive earnings, beginning balance	(63,409)
Other comprehensive earnings, before reclassifications	(62,411)
Other comprehensive earnings, reclassification	694
Other comprehensive earnings, after adjustment	(61,717)	(89,409)	$ 16,459
Accumulated other comprehensive earnings, ending balance	$ (125,126)	$ (63,409)