Earnings Per Share Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended										12 Months Ended			3 Months Ended			12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2010	Sep. 30, 2010 Predecessor [Member]	Dec. 31, 2009 Predecessor [Member]	Sep. 30, 2009 Predecessor [Member]	Jun. 30, 2010 Predecessor [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net Income (Loss) Attributable to Parent	$ 90,604	$ 123,948	$ 136,295	$ 112,279	$ 103,664	$ 108,807	$ 95,818	$ 77,238	$ 74,633	$ 51,300	$ 463,126	$ 385,527	$ 220,546	$ 51,300	$ 46,029	$ 25,761	$ 220,546
Weighted Average Number of Shares Outstanding, Basic										135,232,827			133,845,238	135,232,827	133,492,069	133,229,960	133,845,238
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount														5,069,928			4,334,707
Weighted Average Number of Shares Outstanding, Diluted										140,302,755			138,179,945	140,302,755	137,630,694	136,083,460	138,179,945
Earnings Per Share, Basic										$ 0.38			$ 1.65	$ 380.00	$ 340.00	$ 190.00	$ 1,650.00
Earnings Per Share, Diluted										$ 0.37			$ 1.60	$ 370.00	$ 330.00	$ 190.00	$ 1,600.00