Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Document Fiscal Year Focus	2014
Net income	$ 10,586	$ 9,340
Unrealized gains (losses):
Unrealized holding losses	(603)	(432)
Losses reclassified to net income	610	43
Unrealized gains (losses) on derivative financial instruments, net	7	(389)
Foreign currency translation adjustment	(47)	(2,892)
Defined Benefit Plan, Plan Amendments	142
Defined Benefit Plan, Amortization of Gains (Losses)	1,686
Other Comprehensive Income (Loss), Amortization, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost Recognized in Net Periodic Benefit Cost, before Tax	(360)	0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, Portion Attributable to Parent	1,468	0
Other comprehensive income (loss), before tax	1,428	(3,281)
Income tax (provision) benefit on other comprehensive income (loss)	(492)	720
Other comprehensive income (loss), net of tax	936	(2,561)
Comprehensive income	$ 11,522	$ 6,779