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Net Income per Share (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Net income	$ 10,082	$ 11,452	$ 26,743	$ 30,957
Less distributed and undistributed earnings allocated to participating securities	(289)	(334)	(769)	(898)
Net income allocated to common shares	$ 9,793	$ 11,118	$ 25,974	$ 30,059
Weighted average common shares outstanding (in shares)	24,849	24,923	24,855	25,034
Incremental shares from assumed conversions of common stock options (in shares)	18	57	24	63
Adjusted weighted average common shares outstanding (in shares)	24,867	24,980	24,879	25,097
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect (in shares)	0	41	10	33

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