Stock-Based Compensation (Stock Options) (Details) (USD $)	1 Months Ended		12 Months Ended
	Jan. 31, 2011		Dec. 31, 2012 plan		Dec. 31, 2011		Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans			2
Shares Under Option
Outstanding at the beginning of the period (in shares)	273,672		661,840		273,672		389,970
Granted (in shares)					617,500
Exercised (in shares)			(38,900)		(199,032)		(115,493)
Expired (in shares)					(30,300)		(805)
Forfeited/Expired (in shares)			(294,940)
Outstanding, at the end of the period (in shares)			328,000		661,840		273,672
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 16.46		$ 30.22		$ 16.46		$ 15.66
Granted (in dollars per share)					$ 31.75
Exercised (in dollars per share)			$ 18.23		$ 15.95		$ 13.77
Expired (in dollars per share)					$ 30.92		$ 16.33
Cancelled/Expired (in dollars per share)			$ 31.29
Outstanding at the end of the period (in dollars per share)			$ 30.67		$ 30.22		$ 16.46
Aggregate Intrinsic Value
Intrinsic value, Outstanding at the beginning of the period	$ 3,300,000	[1]	$ 200,000	[1]	$ 3,300,000	[1]	$ 6,700,000	[1]
Intrinsic value of options exercised			100,000		2,200,000		1,700,000
Intrinsic value, Outstanding at the end of the period			200,000	[1]	200,000	[1]	3,300,000	[1]
Number of options granted (in shares)	617,500
Fair value (in dollars per share)	$ 10.90
Fair value assumptions
Proceeds from stock options exercised			725,000		2,403,000		997,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	3 years		3 years
Expiration period (in years)	7 years
Fair value assumptions
Dividend yield (as a percent)	2.50%
Volatility (as a percent)	40.60%
Risk-free interest rate (as a percent)	0.60%
Expected life	7 years
Recognized stock-based compensation expense					2,000,000		0
Unrecognized stock-based compensation expense			$ 1,100,000
Unrecognized stock-based compensation expense, period of recognition			1 year
Stock options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)			10 years

[1] Intrinsic value is defined as the difference between the current market value and the exercise price, for those options where the market price exceeds the exercise price.