Fair Value of Financial Instruments (Details 5) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 12, 2013	Mar. 21, 2013	Oct. 17, 2012	Oct. 01, 2010
Term loan B-2
Fair value measurements
Face value of debt instrument			$ 1,507,500
Notes
Fair value measurements
Face value of debt instrument					$ 650,000
Holdco Notes
Fair value measurements
Face value of debt instrument				$ 550,000
Parent Company | Holdco Notes
Fair value measurements
Face value of debt instrument		$ 450,000		$ 550,000
Level 2 | Term loan B-2
Fair value measurements
Face value of debt instrument	$ 1,507,500
Level 2 | Notes
Fair value measurements
Fair value of Notes	$ 680,875