Employee Stock Benefit Plans (Narrative) (Details) (USD $)	3 Months Ended	12 Months Ended									3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Restricted Stock Units (RSUs)	Dec. 31, 2012 Restricted Stock Units (RSUs)	Dec. 31, 2011 Restricted Stock Units (RSUs)	Dec. 31, 2013 Stock Appreciation Rights (SARs)	Dec. 31, 2012 Stock Appreciation Rights (SARs)	Dec. 31, 2013 Stock Options	Dec. 31, 2013 Chief Executive Officer [Member] Stock Appreciation Rights (SARs)	Dec. 31, 2013 Executive Officer [Member] Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock authorized for issuance as equity-based compensation			2,960,000
Stock options granted		203,825	163,042	168,939
Granted					131,555	215,180	165,253	244,229	3,000		240,829
Award vesting period		4 years						4 years				4 years
Share-based compensation expense		$ 5,063,000	$ 3,321,000	$ 5,016,000
Non-cash compensation charges	1,700,000	700,000
Closing stock price		$ 21.00
Total unrecognized compensation expense related to nonvested stock options		1,300,000
Total fair value of shares vested during period		1,700,000	1,200,000	1,900,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
Unrecognized compensation cost related to nonvested non-option equity awards granted					$ 1,500,000			$ 2,300,000
Unrecognized compensation cost related to nonvested non-option equity awards granted, period for recognition					1 year 11 months 9 days			4 years 11 months 19 days		2 years 9 months