Condensed Consolidated Statements Of Stockholders' Equity Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares, Outstanding		48,082,800		(600,000)
Stockholders' Equity Attributable to Parent	$ 1,035,744	$ 481	$ 354,210	$ (42,543)	$ 769,575	$ (45,979)
Net income	65,038				65,038
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	64,910					(128)
Other Comprehensive Income (Loss), Net of Tax	(128)
Dividends, Common Stock, Cash	(43,966)				(43,966)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		156,038
Stock Issued During Period, Value, Stock Options Exercised	5,274	$ 2	5,272
Stock Issued During Period, Shares, Employee Stock Purchase Plans		32,154
Stock Issued During Period, Value, Employee Stock Purchase Plan	1,995		1,995
Stock Issued During Period, Shares, Restricted Stock Award, Gross		140,757
Stock Issued During Period, Value, Restricted Stock Award, Gross	0	$ (1)	(1)
Common Shares Repurchased And Retired During Period Shares		(645,880)		600,000
Stock Repurchased and Retired During Period, Value	(3,807)	$ (6)	(7,672)	$ 42,543	(38,672)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	11,948		11,883		65
Shares, Outstanding		47,661,015		0
Stockholders' Equity Attributable to Parent	1,056,654	$ 477	358,932	$ 0	742,173	(44,928)
Net income	32,589				32,589
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	31,410					(1,179)
Other Comprehensive Income (Loss), Net of Tax	(1,179)
Dividends, Common Stock, Cash	(22,208)				(22,208)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		500
Stock Issued During Period, Value, Stock Options Exercised	15	$ 0	15
Stock Issued During Period, Shares, Employee Stock Purchase Plans		32,154
Stock Issued During Period, Value, Employee Stock Purchase Plan	1,995		1,995
Stock Issued During Period, Shares, Restricted Stock Award, Gross		101,680
Stock Issued During Period, Value, Restricted Stock Award, Gross		$ (1)	(1)
Common Shares Repurchased And Retired During Period Shares		(29,480)
Stock Repurchased and Retired During Period, Value	(2,630)	$ 0	(2,086)		(544)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	6,862		6,832		30
Shares, Outstanding		47,765,869		0
Stockholders' Equity Attributable to Parent	1,072,098	$ 478	365,687	$ 0	752,040	(46,107)
Shares, Outstanding		47,654,929		0
Stockholders' Equity Attributable to Parent	1,311,192	$ 476	465,652	$ 0	891,526	(46,462)
Net income	31,697				31,697
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	23,359					(8,338)
Other Comprehensive Income (Loss), Net of Tax	$ (8,338)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	41,530	41,530
Stock Issued During Period, Value, Stock Options Exercised	$ 952	$ 0	1,583		(631)
Stock Issued During Period, Shares, Employee Stock Purchase Plans		53,694
Stock Issued During Period, Value, Employee Stock Purchase Plan	3,303		3,303
Stock Issued During Period, Shares, Restricted Stock Award, Gross		248,001
Stock Issued During Period, Value, Restricted Stock Award, Gross	0	$ (3)	(3)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments	(12)		(12)
Common Shares Repurchased And Retired During Period Shares		(1,105,463)
Stock Repurchased and Retired During Period, Value	(88,469)	$ (10)	(16,099)		(72,360)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	12,843		12,843
Shares, Outstanding		47,113,423		0
Stockholders' Equity Attributable to Parent	1,241,081	$ 471	462,430	$ 0	832,648	(54,468)
Net income	38,101				38,101
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	37,769					(332)
Other Comprehensive Income (Loss), Net of Tax	(332)
Stock Issued During Period, Shares, Employee Stock Purchase Plans		53,694
Stock Issued During Period, Value, Employee Stock Purchase Plan	3,303		3,303
Stock Issued During Period, Shares, Restricted Stock Award, Gross		70,505
Stock Issued During Period, Value, Restricted Stock Award, Gross		$ (1)	(1)
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments	(12)		(12)
Common Shares Repurchased And Retired During Period Shares		(344,931)
Stock Repurchased and Retired During Period, Value	(25,503)	$ (3)	(4,983)		(20,517)
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	6,530		6,530
Shares, Outstanding		46,892,691		0
Stockholders' Equity Attributable to Parent	$ 1,263,168	$ 469	$ 467,267	$ 0	$ 850,232	$ (54,800)