Comprehensive Income (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Net current-period other comprehensive income (loss)	$ 172,447,000	$ 118,545,000
Amounts reclassified to net earnings relating to amortization of actuarial losses	800,000	1,500,000
Pension Liability [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
AOCI beginning balance	(24,978,000)	(44,507,000)
Amounts reclassified from AOCI	449,000	1,030,000
Net current-period other comprehensive income (loss)	449,000	1,030,000
AOCI ending balance	(24,529,000)	(43,477,000)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
AOCI beginning balance	12,449,000	5,645,000
Other comprehensive income loss before reclassifications	3,252,000	(29,086,000)
Net current-period other comprehensive income (loss)	3,252,000	(29,086,000)
AOCI ending balance	$ 15,701,000	$ (23,441,000)