Shareholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Before-tax amount [Abstract]
Foreign currency translation adjustment	$ (17,025)	$ (49,820)	$ (64,630)	$ (61,208)
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)	962	0	962	0
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(296)	217	(1,104)	(556)
Net hedging loss reclassified into net income	412	430	1,235	1,275
Pension plan benefits liability adjustment	877	141	1,887	449
Total other comprehensive income (loss), before tax	(15,070)	(49,032)	(61,650)	(60,040)
Tax (provision) benefit [Abstract]
Foreign currency translation adjustment	325	429	696	448
Disposal Group, including discontinued operations, Foreign Currency Translation Gains (Losses), tax (provision) benefit	0	0	0	0
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	114	(83)	423	212
Net hedging loss reclassified into net income	(159)	(164)	(474)	(487)
Pension plan benefits liability adjustment	(11)	(43)	(24)	(136)
Total other comprehensive income (loss) tax (provision) benefit	269	139	621	37
Net-of-tax amount [Abstract]
Foreign currency translation adjustment	(16,700)	(49,391)	(63,934)	(60,760)
Net unrealized gain (loss) on derivative instruments designated as cash flow hedges	(182)	134	(681)	(344)
Net hedging loss (gain) reclassified into net income	253	266	761	788
Pension plan benefits liability adjustment	866	98	1,863	313
Total other comprehensive income (loss), net of tax	14,801	48,893	61,029	60,003
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Losses)	962	0	962	0
Disposal Group, Including Discontinued Operation, Foreign Currency Translation Gains (Loses), Before-tax Amount	$ 962	$ 0	962	0
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Net-of-tax amount [Abstract]
Total other comprehensive income (loss), net of tax			62,972	60,760
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Net-of-tax amount [Abstract]
Total other comprehensive income (loss), net of tax			$ (80)	$ (444)