Stock Compensation and Share Repurchase Plan (Narrative) (Details) (USD $)	12 Months Ended				0 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 16, 2013 2013 Stock Incentive Plan [Member]	Jun. 16, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Stock Repurchase Plan [Member]	Dec. 31, 2013 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2013 Nonvested Stock [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 Prior To 2011 [Member] Restricted Stock [Member]	Dec. 31, 2013 Subsequent To 2011 [Member] Restricted Stock [Member]
Shareholders Equity and Share-Based Payments [Line Items]
Stock Units Granted To Executives That Cliff Vest, Period					4 years	3 years
Compensation cost	$ 5,017,000	$ 4,041,000	$ 3,785,000			$ 144,000	$ 237,000	$ 391,000		$ 778,000	$ 1,100,000	$ 1,200,000		$ 3,700,000	$ 2,700,000	$ 2,300,000
Total income tax benefit recognized related to stock-based compensation						58,000	95,000	156,000		311,000	448,000	463,000		1,500,000	1,100,000	899,000
Restricted Stock Units At Fair Value														2,000,000	1,900,000	919,000
Total intrinsic value of options exercised										2,300,000	1,200,000	147,000
Cash received from exercise of stock options										159,000	831,000	230,000
Stock option compensation cost										6,400,000	981,000	309,000
Total fair value of restricted stock shares/units vested and released							0	677,000
Total unrecognized compensation cost related to nonvested stock awards						105,000							640,000	6,400,000
Expected recognized over a weighted-average period, years						4 months 24 days							7 months 21 days	1 year 4 months 24 days
Share-based compensation award, vesting period																	5 years	3 years
Income tax benefits received	1,700,000	1,200,000	694,000
Net tax benefit from stock options exercised	148,000
Tax deficiency from stock options exercised		59,000	261,000
Shares of common stock for issuance under the plan				4,000,000
Stock Repurchase Program Number Of Shares Authorized, Amended									15,000,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased									12,000,000
Stock Repurchased During Period, Shares	98,027	512,280	2,500,000
Stock Repurchase Program Number Of Shares Tendered										438,000	38,000
Cancellation Of Restricted Stock Shares To Pay Withholding														49,000	46,000
Cancellation Of Restricted Stock Units To Pay Withholding						0	0
Aggregate Intrinsic Value										$ 4,700,000	$ 1,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term										3 years