Compensation Plans-Stock Option Activity (Details) (Stock options and stock-settled stock appreciation rights [Member], USD $)	12 Months Ended
	Dec. 31, 2012
Stock options and stock-settled stock appreciation rights [Member]
Shares
Outstanding at beginning of period	798,984
Granted	0
Exercised	(119,290)
Forfeited	(27,853)
Outstanding at end of period	651,841
Weighted Average Exercise Price
Outstanding at beginning of period (usd per share)	$ 16.13
Granted (usd per share)	$ 0.00
Exercised (usd per share)	$ 10.33
Forfeited (usd per share)	$ 13.56
Outstanding at end of period (usd per share)	$ 17.30
Additional Disclosures
Exercisable	562,841
Exercisable (usd per share)	$ 18.12
Outstanding, Weighted Average Remaining Contractual Term	4 years 6 months
Exercisable, Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Outstanding, Intrinsic Value	$ 0
Exercisable, Intrinsic Value	$ 0