Related Party Transactions (Details) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	Apr. 02, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Related party transactions
Annual management fee		$ 1,250,000	$ 1,250,000	$ 2,500,000	$ 2,500,000
Dividend declared and paid	20,800,000
Holding PIK Notes
Related party transactions
Cash interest (as a percent)				9.25%
PIK interest (as a percent)				10.00%
Debt Instrument, Face Amount		450,000,000		450,000,000
CD&R
Related party transactions
Annual fee				5,000,000
Annual management fee		$ 1,250,000	$ 1,250,000	$ 2,500,000	$ 2,500,000