Summary of Significant Accounting Policies (Details 7) (USD $)	12 Months Ended										1 Months Ended	12 Months Ended		12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Dividend Equivalent Rights Award	Dec. 31, 2012 Dividend Equivalent Rights Award	Dec. 31, 2013 Long-Term Incentive Plan	Dec. 31, 2012 Long-Term Incentive Plan	Dec. 31, 2011 Long-Term Incentive Plan	May 02, 2012 Long-Term Incentive Plan	Apr. 30, 2010 Long-Term Incentive Plan	Aug. 31, 2012 Long-Term Incentive Plan Stock Options	Dec. 31, 2013 Long-Term Incentive Plan Stock Options	Feb. 08, 2012 Long-Term Incentive Plan Stock Options	Dec. 31, 2013 Long-Term Incentive Plan Restricted Stock and Restricted Stock Units	Dec. 31, 2012 Long-Term Incentive Plan Restricted Stock and Restricted Stock Units	Dec. 31, 2011 Long-Term Incentive Plan Restricted Stock and Restricted Stock Units	Sep. 30, 2012 Long-Term Incentive Plan Restricted Stock and Restricted Stock Units Chief operating officer	Dec. 31, 2011 Long-Term Incentive Plan Bonus award Chief executive officer	Feb. 29, 2012 Long-Term Incentive Plan Performance award based on the EBITDA performance of the Company in 2011 - 2012 Key employees	Dec. 31, 2013 Long-Term Incentive Plan Performance award based on the EBITDA performance of the Company in 2012 - 2015	Dec. 31, 2011 Long-Term Incentive Plan Performance award based on the EBITDA performance of the Company in 2012 - 2015 Key employees	Dec. 31, 2013 Long-Term Incentive Plan Deferred Stock Units	Dec. 31, 2012 Long-Term Incentive Plan Deferred Stock Units	Dec. 31, 2011 Long-Term Incentive Plan Deferred Stock Units	Dec. 31, 2013 Employee Stock Purchase Plan	Dec. 31, 2012 Employee Stock Purchase Plan	Dec. 31, 2011 Employee Stock Purchase Plan
Details of stock benefit plans
Granted (in shares)														19,000				10,000					5,000	0
Potential award grant based on achievement of performance criteria (in shares)																			2,912,000		2,650,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized												$ 16,400,000		$ 800,000						$ 97,600,000
Unvested stock options outstanding (in shares)													10,000,000
Dividend equivalent rights threshold for accumulated accrued dividend distribution (in shares)												1,000
Additional options granted by Board of Directors (in shares)											2,000,000
Shares
Non-vested balance at the beginning of the period (in shares)														694,000
Granted (in shares)														19,000				10,000					5,000	0
Vested (in shares)														(352,000)
Forfeited (in shares)														(10,000)			(82,000)
Non-vested balance at the end of the period (in shares)														351,000	694,000							3,000
Weighted Average Grant Date Fair Value Per Share (in dollars per share)
Non-vested shares at the beginning of the period (in dollars per share)														$ 9.73
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value														$ 38.26	$ 22.92	$ 17.57						$ 38.26	$ 24.20
Vested (in dollars per share)														$ 10.20
Forfeited (in dollars per share)														$ 8.12
Non-vested shares at the end of the period (in dollars per share)														$ 10.84	$ 9.73
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Grants in Period, Aggregate Grant Date Fair Value														700,000	67,300,000	800,000						100,000	100,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value														3,600,000	68,500,000	4,200,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition												2 years 8 months 5 days		6 months 28 days
Number of shares to be issued for each award																						1
Period following cessation of the non-employee director's service after which shares are to be delivered (in days)																						30 days
Percentage of the market value of common stock at beginning or end of the offering period for shares eligible to be purchased																									90.00%
Successive offering period under plan																									6 months
Maximum number of shares of common stock authorized to be issued under the Plan									28,133,332			1,000,000
Number of shares of common stock that may be issued under the Plan									28,133,332	19,333,332		1,000,000													2,000,000
Shares available for purchase (in shares)						5,083,000																			1,883,000
Share-based compensation general disclosures
Selling, general and administrative, stock-based compensation	27,034,000	62,875,000	54,261,000	7,600,000	6,100,000	26,800,000	62,600,000	54,100,000																	200,000	300,000	200,000
Total intrinsic value of purchase rights exercised during the six-month period																									200,000	300,000	200,000
Option vesting term (in years)												4 years
Modified EBITDA for an additional performance award																					$ 500,000,000