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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator [Abstract]
Net income	$ 10,140	$ 11,820
Basic earnings per share [Abstract]
Weighted average shares (in shares)	15,735,000	15,539,000
Diluted earnings per share [Abstract]
Effect of dilutive stock options and restricted stock grants (in shares)	86,000	53,000
Adjusted weighted average shares (in shares)	15,821,000	15,592,000
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$ 0.64	$ 0.76
Diluted earnings per share (in dollars per share)	$ 0.64	$ 0.76
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from diluted calculations (in shares)	0	88,246
Weighted average price for anti dilutive securities (in dollars per share)		$ 38.95

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