Stock-Based Compensation (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Based Compensation [Line Items]
Number Of Stock Options Settled For Fully Vested Shares	44,800	782,980
Number Of Shares Issued In Settlement Of Stock Option	17,048	214,624
Deferred Income Tax Expense (Benefit)	$ (285,000)	$ 716,000	$ 147,000
Unrecognized Compensation Cost	806,000
Proceeds from Stock Options Exercised	63,000	284,000	355,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	703,000	6,544,000	123,000
Shares Representing Outstanding Award	524,456
Income Tax Expense (Benefit)	14,732,000	13,114,000	10,531,000
Stock Option [Member]
Stock Based Compensation [Line Items]
Deferred Income Tax Expense (Benefit)	517,000	571,000	645,000
Two Thousand and Eleven Plan [Member]
Stock Based Compensation [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,355,764
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Outstanding, Number	288,875
Common Stock, Capital Shares Reserved for Future Issuance	1,060,505
Equity Option [Member]
Stock Based Compensation [Line Items]
Income Tax Expense (Benefit)	359,000	2,034,000	131,000
Restricted Stock Units (Rsus) [Member]
Stock Based Compensation [Line Items]
Unrecognized Compensation Cost	4,691,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	4 years 1 month 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 1,164,000	$ 1,667,000	$ 1,024,000