Nature of Business and Significant Accounting Policies Nature of Business and Significant Accounting Policies (Details 7) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Changes from Accumulated Other Comprehensive income [Abstract]
Pension plans, beginning balance	$ (5,127)
Pension plans adjustment, before reclassification	184
Pension plans, reclassification	2,777
Pension plans adjustment, after reclassification	2,961	745	(1,113)
Pension plans, ending balalnce	(2,166)	(5,127)
Cash flow hedges, beginning balance	0
Cash flow hedges adjustment, before reclassification	1,105
Cash flow hedges, reclassification	555
Cash flow hedges adjustment, after reclassification	1,660	0	0
Cash flow hedges, ending balance	1,660	0
Foreign currency translation, beginning balance	14,668
Foreign currency translation adjustment	11,838	20,790	(12,533)
Foreign currency translation, ending balance	26,506	14,668
Accumulated other comprehensive earnings, beginning balance	9,541
Other comprehensive earnings, before reclassifications	13,127
Other comprehensive earnings, reclassification	3,332
Other comprehensive earnings, after adjustment	16,459	21,535	(13,646)
Accumulated other comprehensive earnings, ending balance	$ 26,000	$ 9,541