Common and Preferred Stock, Long-Term Incentive Compensation Plan, Stock Options (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	94,070
Exercised (in shares)	94,070
Forfeited (in shares)	0
Outstanding, end of period (in shares)	0	94,070
Exercisable, end of period (in shares)	0
Stock Options, Weighted Average Exercise Price [Roll Forward]
Weighted average exercise price, outstanding, beginning of period (in dollars per share)	$ 21.12
Weighted average exercise price, exercised (in dollars per share)	$ 21.12
Weighted average exercise price, forfeited (in dollars per share)	$ 0.00
Weighted average exercise price, outstanding, end of period (in dollars per share)	$ 0.00	$ 21.12
Weighted average exercise price, exercisable, end of period (in dollars per share)	$ 0.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	0 years
Stock Options, Weighted Average Remaining Contractual Term [Roll Forward]
Weighted average remaining contractual term, outstanding, beginning of period (in years)	0 years	14 years 11 months
Weighted average remaining contractual term, outstanding, end of period (in years)	0 years	14 years 11 months
Stock Options, Aggregate Intrinsic Value [Roll Forward]
Aggregate intrinsic value, outstanding, beginning of period	$ 1,597,000
Aggregate intrinsic value of options exercised during the year	1,765,000
Aggregate intrinsic value, outstanding, end of period	0	1,597,000
Agregate instrinsic value, exercisable end of period	0
Stock Options, Additional General Disclosures [Abstract]
Stock Options, Outstanding (in shares)	0	94,070
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0
Aggregate intrinsic value of options exercised during the year	1,765,000
Stock Options [Member]
Stock Options, Aggregate Intrinsic Value [Roll Forward]
Aggregate intrinsic value of options exercised during the year	1,800,000	500,000	1,100,000
Stock Options, Additional General Disclosures [Abstract]
Aggregate intrinsic value of options exercised during the year	1,800,000	500,000	1,100,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	2,000,000	900,000	3,200,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$ 700,000	$ 200,000	$ 400,000
2000 Long-Term Incentive Compensation Plan [Member]
Stock Options, Outstanding [Roll Forward]
Outstanding, end of period (in shares)	0
Stock Options, Additional General Disclosures [Abstract]
Stock Options, Outstanding (in shares)	0