Earnings Per Share (Calculation of Basic and Diluted EPS) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income	$ 7,359us-gaap_NetIncomeLoss	$ 7,238us-gaap_NetIncomeLoss
Average Common Shares:
Basic (weighted-average outstanding shares)	11,280,000	12,084,000
Dilutive potential common shares from stock options, shares	156,000	186,000
Diluted (weighted-average outstanding shares)	11,436,000	12,270,000
Basic earnings per share (in dollars per share)	$ 0.65us-gaap_EarningsPerShareBasic	$ 0.60us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share)	$ 0.64us-gaap_EarningsPerShareDiluted	$ 0.59us-gaap_EarningsPerShareDiluted
Stock options excluded from diluted earnings per share calculation because the effect would be anti-dilutive	66,650	0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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