CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common stock	Additional paid-in capital	Unearned compensation	Retained earnings	Accumulated other comprehensive (loss) income	Treasury stock
Balance at Dec. 31, 2012	$ 667,265	$ 265	$ 585,360	$ (3,035)	$ 122,014	$ (2,979)	$ (34,360)
Balance (in shares) at Dec. 31, 2012		25,148
Comprehensive income:
Net income	22,502				22,502
Other comprehensive income (loss)	(3,231)					(3,231)
Total comprehensive income	19,271
Cash dividends declared $0.18 and $0.36 for the period ended June 30, 2014 and 2013, respectively	(9,068)				(9,068)
Treasury stock purchased	(8,868)						(8,868)
Treasury stock purchased (in shares)		(348)
Forfeited shares			10	140			(150)
Forfeited shares (in shares)		(6)
Exercise of stock options	2,582				(2,518)		5,100
Exercise of stock options (in shares)		195
Restricted stock grants			(690)	(3,717)			4,407
Restricted stock grants (in shares)		155
Stock-based compensation	1,812		585	1,227
Net tax benefit related to stock-based compensation	1,150		1,150
Other, net	(1,174)		(14)				(1,160)
Other, net (in shares)		(48)
Balance at Jun. 30, 2013	672,970	265	586,401	(5,385)	132,930	(6,210)	(35,031)
Balance (in shares) at Jun. 30, 2013		25,096
Balance at Dec. 31, 2013	678,062	265	587,247	(5,563)	141,958	(9,057)	(36,788)
Balance (in shares) at Dec. 31, 2013		25,036
Comprehensive income:
Net income	10,358				10,358
Other comprehensive income (loss)	13,333					13,333
Total comprehensive income	23,691
Cash dividends declared $0.18 and $0.36 for the period ended June 30, 2014 and 2013, respectively	(9,122)				(9,122)
Treasury stock purchased	(2,467)						(2,467)
Treasury stock purchased (in shares)		(100)
Forfeited shares			(6)	156			(150)
Forfeited shares (in shares)		(7)
Exercise of stock options	848				(945)		1,793
Exercise of stock options (in shares)		72
Restricted stock grants			44	(3,264)			3,220
Restricted stock grants (in shares)		130
Stock-based compensation	1,824		41	1,783
Net tax benefit related to stock-based compensation	(1,980)		(1,980)
Other, net	(393)		(6)				(387)
Other, net (in shares)		(16)
Balance at Jun. 30, 2014	$ 690,463	$ 265	$ 585,340	$ (6,888)	$ 142,249	$ 4,276	$ (34,779)
Balance (in shares) at Jun. 30, 2014		25,115