Consolidated Statement of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Additional Paid-in-Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance at Dec. 31, 2013	$ 1,035,175	$ 257	$ 368,641	$ 776,101	$ (51,677)	$ (58,147)
Beginning balance, shares at Dec. 31, 2013		25,746
Net income	31,303
Other comprehensive income (loss), net	7,435				7,435
Treasury Stock, Value, Acquired, Cost Method	(16,942)					(16,942)
Equity component of 3.00% Convertible Note issuance, net of deferred tax liability	899		899
Issuance of common and treasury shares to employee benefit plans, shares		55
Issuance of common and treasury shares to employee benefit plans	(1,088)	1	(5,192)			4,103
Tax effect from options exercised and the vesting of restricted shares	733		733
Stock-based compensation	3,647		3,647
Cash dividends	(4,102)			(4,102)
Ending balance at Mar. 31, 2014	$ 1,057,060	$ 258	$ 368,728	$ 803,302	$ (44,242)	$ (70,986)
Ending balance, shares at Mar. 31, 2014		25,801