Stock-Based Compensation (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended							12 Months Ended										12 Months Ended		0 Months Ended				12 Months Ended																12 Months Ended
	Mar. 15, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Equity Option [Member]	Dec. 31, 2012 Equity Option [Member]	Dec. 31, 2011 Equity Option [Member]	Dec. 31, 2013 Equity Option [Member]	Dec. 31, 2013 Fully-Vested Stock Awards [Member]	Dec. 31, 2012 Fully-Vested Stock Awards [Member]	Dec. 31, 2011 Fully-Vested Stock Awards [Member]	Dec. 31, 2012 Performance Shares [Member]	Dec. 31, 2013 Ristricted Stock And Performance Shares Combined [Member]	Dec. 31, 2012 Ristricted Stock And Performance Shares Combined [Member]	Dec. 31, 2011 Ristricted Stock And Performance Shares Combined [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2013 Minimum [Member] Equity Option [Member]	Dec. 31, 2013 Minimum [Member] Equity Option [Member]	Dec. 31, 2013 Maximum [Member] Equity Option [Member]	Dec. 31, 2013 Maximum [Member] Equity Option [Member]	Mar. 06, 2012 Granted to Employee Director [Member] Performance Shares [Member]	Mar. 15, 2011 Granted to Employee Director [Member] Performance Shares [Member]	Mar. 06, 2012 Granted to Executive [Member] Performance Shares [Member]	Mar. 15, 2011 Granted to Executive [Member] Performance Shares [Member]	Dec. 31, 2013 Granted to Non-Employee Directors [Member] Fully-Vested Stock Awards [Member]	Dec. 31, 2012 Granted to Non-Employee Directors [Member] Fully-Vested Stock Awards [Member]	Dec. 31, 2011 Granted to Non-Employee Directors [Member] Fully-Vested Stock Awards [Member]	Dec. 31, 2013 The Omnibus Plan [Member] Equity Option [Member]	Dec. 31, 2012 The Omnibus Plan [Member] Equity Option [Member]	Dec. 31, 2011 The Omnibus Plan [Member] Equity Option [Member]	Dec. 31, 2013 The Omnibus Plan [Member] Fully-Vested Stock Awards [Member]	Dec. 31, 2012 The Omnibus Plan [Member] Fully-Vested Stock Awards [Member]	Dec. 31, 2011 The Omnibus Plan [Member] Fully-Vested Stock Awards [Member]	Dec. 31, 2013 The Omnibus Plan [Member] Restricted Stock [Member]	Dec. 31, 2012 The Omnibus Plan [Member] Restricted Stock [Member]	Dec. 31, 2011 The Omnibus Plan [Member] Restricted Stock [Member]	Dec. 31, 2012 The Omnibus Plan [Member] Performance Shares [Member]	Dec. 31, 2011 The Omnibus Plan [Member] Performance Shares [Member]	Dec. 31, 2013 The Omnibus Plan [Member] Granted to Employee Director [Member] Restricted Stock [Member]	Dec. 31, 2013 The 1998 Plan [Member]	Dec. 31, 2013 The 1998 Plan [Member] Equity Option [Member]	Dec. 31, 2013 The 1998 Plan [Member] Granted to Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation		$ 2,156	$ 1,989	$ 1,958								$ (807)	$ 1,706	$ 1,652	$ 1,588										$ 450	$ 337	$ 370	$ 0	$ 0	$ 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		3,517
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		3 years 2 months 12 days
Excess Tax Benefit from Share-based Compensation, Financing Activities		203	199	425
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized																												900,000												900,000
Share-based Compensation Arrangement by Share-based Payment Award, Description																												The Omnibus Plan allows for the issuance of 900,000 shares of common stock through the granting of stock options or stock awards (including performance units convertible into stock) to key employees and directors at no less than 100% of fair market value on the date of the grant. The Omnibus Plan provides for the granting of "nonqualified options" with a duration of not more than ten years from the date of grant													The 1998 Plan provides for the award of stock options to key employees and directors to purchase up to 900,000 shares of common stock at no less than 100% of fair market value on the date of the grant. The 1998 Plan provides for the granting of "nonqualified options" and "incentive stock options" with a duration of not more than ten years from the date of grant.
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights																												The Omnibus Plan also provides that, unless otherwise set forth in the option agreement, stock options are exercisable in installments of up to 25% annually beginning one year from the date of grant													The 1998 Plan also provides that, unless otherwise set forth in the option agreement, stock options are exercisable in installments of up to 25% annually beginning one year from date of grant
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Terms																																									Non-employee directors were automatically awarded fully vested, nonqualified stock options to acquire 5,000 shares of the Company's common stock on each date the outside directors were elected at an annual shareholders' meeting to serve as directors. The 1998 Plan was amended in May 2006 to remove the automatic awarding of stock options to outside directors
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross					0	0	0																					0	0	0												5,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value					687	743	773
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit					$ 7.81	$ 7.81	$ 4.23									$ 7.81	$ 7.81		$ 9.29
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit					$ 14.77	$ 14.77	$ 14.77										$ 8.97		$ 14.77
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price, Beginning of Period					$ 10.41	$ 8.94		$ 10.64										$ 8.39		$ 13.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term					1 year 3 months 18 days	2 years 2 months 12 days	2 years 9 months 18 days
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price					$ 9.30	$ 7.03	$ 5.02
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value					124	457	1,112
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period									3,500	3,500	3,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period																						1,500		1,000	9,960	12,000	10,500							12,973	42,677	46,436			66,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period																					1,436		957														34,000	20,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 38.46																														$ 45.16	$ 28.05	$ 35.24
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Grants In Period, Aggregate Fair Value																						58		38
Stock Issued During Period, Value, New Issues		(673)	(546)	(148)																																	1,130	670
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					3,750	17,450	41,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
Stock Issued During Period, Value, Treasury Stock Reissued																																					$ 1,130	$ 670