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Earnings per Share (Details) (USD $)	3 Months Ended												12 Months Ended
Earnings per Share (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share, Basic and Diluted [Abstract]
Basic earnings per common share (in dollars per share)	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.35us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 0.43us-gaap_EarningsPerShareBasic	$ 1.68us-gaap_EarningsPerShareBasic	$ 1.58us-gaap_EarningsPerShareBasic	$ 1.91us-gaap_EarningsPerShareBasic
Diluted earnings per common share (in dollars per share)	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.34us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.45us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 1.67us-gaap_EarningsPerShareDiluted	$ 1.53us-gaap_EarningsPerShareDiluted	$ 1.80us-gaap_EarningsPerShareDiluted
Basic weighted average shares outstanding (in shares)													37,809,000	37,588,000	36,948,000
Diluted weighted average shares outstanding (in shares)													38,040,000	38,642,000	39,100,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount													135,000	315,000	90,000
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Basic weighted average shares outstanding (in shares)													37,809,000	37,588,000	36,948,000
Incremental shares for common stock equivalents (in shares)													231,000	1,054,000	2,152,000
Diluted shares outstanding (in shares)													38,040,000	38,642,000	39,100,000