Balance Sheets Parentheticals (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Common Class A	Dec. 31, 2011 Common Class A	Dec. 31, 2012 Common Class B	Dec. 31, 2011 Common Class B	Dec. 31, 2012 Senior Notes 6.75 Percent Due 2020	Dec. 31, 2011 Senior Notes 6.75 Percent Due 2020	Dec. 31, 2012 Senior Notes 10.25 Percent Due 2014	Dec. 31, 2011 Senior Notes 10.25 Percent Due 2014	Dec. 31, 2012 Senior Notes 6.375% Due 2022	Dec. 31, 2011 Senior Notes 6.375% Due 2022	Dec. 31, 2012 Senior Subordinated Notes 8.25 Percent Due 2016	Dec. 31, 2011 Senior Subordinated Notes 8.25 Percent Due 2016
Interest rate on debt instrument (as a percent)							6.75%	6.75%	10.25%	10.25%	6.375%	6.375%	8.25%	8.25%
Common Stock, Par or Stated Value Per Share			$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common Stock, Shares Authorized			100,000,000	100,000,000	3,000,000	3,000,000
Common Stock, Shares, Issued			52,428,423	52,067,994	1,763,866	1,797,784
Common Stock, Shares, Outstanding			52,428,423	52,067,994	1,763,866	1,797,784
Common Stock Liquidation Preference Value					$ 0.50	$ 0.50
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	2,000,000	2,000,000
Preferred Stock, Shares Outstanding	0	0