General - Basis of Presentation (Details 3) (USD $)	3 Months Ended		6 Months Ended		1 Months Ended		6 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2012 Restricted stock and restricted stock units former Chief Operating Officer	Aug. 31, 2012 Dividend equivalent rights	Jun. 30, 2013 Dividend equivalent rights	Feb. 08, 2012 Dividend equivalent rights	Jun. 30, 2013 Dividend equivalent rights Chief Executive Officer and certain full-time employees	Jun. 30, 2013 Long-Term Incentive Plan	Jun. 30, 2012 Long-Term Incentive Plan	Jun. 30, 2013 Long-Term Incentive Plan	Jun. 30, 2012 Long-Term Incentive Plan	May 31, 2012 Long-Term Incentive Plan	Dec. 31, 2010 Long-Term Incentive Plan Performance award based on the EBITDA performance of the Company in 2011 and 2012 Key employees	Jun. 30, 2013 Long-Term Incentive Plan Restricted stock and restricted stock units	Jun. 30, 2012 Long-Term Incentive Plan Restricted stock and restricted stock units	Jun. 30, 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	Jun. 30, 2013 Long-Term Incentive Plan Stock, restricted stock and restricted stock units	Jun. 30, 2012 Long-Term Incentive Plan Stock, restricted stock and restricted stock units	Jun. 30, 2013 Long-Term Incentive Plan Deferred stock units	Jun. 30, 2012 Long-Term Incentive Plan Deferred stock units	Jun. 30, 2013 Employee Stock Purchase Plan	Jun. 30, 2012 Employee Stock Purchase Plan	Jun. 30, 2013 Employee Stock Purchase Plan	Jun. 30, 2012 Employee Stock Purchase Plan
Details of stock benefit plans
Potential award grant based on achievement of performance criteria (in shares)															2,912,000				2,650,000
Modified EBITDA for an additional performance award																		$ 500,000,000
Unrecognized compensation expense (in dollars)																		93,200,000		1,700,000		19,000
Shares
Non-vested balance at the beginning of the period (in shares)																				694,000
Granted (in shares)																				19,000		3,000	5,000
Vested (in shares)																				(24,000)
Forfeited (in shares)					(82,000)															(10,000)
Non-vested balance at the end of the period (in shares)																679,000				679,000
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
Granted (in dollars per share)																				$ 38.26	$ 22.92	$ 38.26	$ 24.20
Vested (in dollars per share)																				$ 23.79
Forfeited (in dollars per share)																				$ 8.12
Non-vested shares at the end of the period (in dollars per share)																				$ 10.04
Total grant date fair value of the stock awards granted (in dollars)																				800,000	67,300,000	100,000	100,000
Total fair value of stock awards that vested during the period (in dollars)																600,000	500,000
Weighted-average period over which unrecognized compensation cost is expected to be recognized																				1 year 22 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																						30 days
Unvested stock options outstanding (in shares)								10,000,000
Dividend equivalent rights threshold for accumulated accrued dividend distribution (in shares)							2,000
Additional options granted by Board of Directors (in shares)						2,000,000			300,000
Number of shares of common stock that may be issued under the Plan														19,333,332										2,000,000		2,000,000
Maximum number of shares of common stock authorized to be issued under the Plan										28,133,332		28,133,332
Share-based compensation general disclosures
Stock-based compensation for dividend equivalent rights										2,000,000	1,700,000	4,100,000	1,700,000
Percentage of the market value of common stock at beginning or end of the offering period for shares eligible to be purchased																								90.00%		90.00%
Successive offering period under Plan																										6 months
Shares available for grant (in shares)										6,155,000		6,155,000												1,898,000		1,898,000
Purchase rights outstanding (in shares)																										0
Stock-based compensation expense
Stock-based compensation expense	$ 7,322,000	$ 15,124,000	$ 14,419,000	$ 32,133,000						$ 7,227,000	$ 14,968,000	$ 14,272,000	$ 31,917,000					$ 0						$ 95,000	$ 156,000	$ 147,000	$ 216,000