Long-Term Equity Compensation (Weighted Average Assumptions) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Long Term Equity Compensation [Abstract]
Risk-free interest rate	0.00%	[1]	2.36%	2.65%
Expected option lives (in years)	0 years	[1]	5 years 1 month 6 days	5 years 4 months 24 days
Expected volatility for options	0.00%	[1]	35.60%	43.50%
Weighted-average grant-date fair value of options	$ 0	[1]	$ 10.88	$ 10.01
Expected dividend yield	0.00%	[1]	0.00%	0.00%
Total intrinsic value of options exercised	$ 7,418,459	[1]	$ 7,934,673	$ 1,449,985
Options granted	0		661,950	1,076,179

[1] During the year ended December 31, 2012, we made no grants of stock options.