CONDENSED CONSOLIDATED STATEMENT OF MEMBERS' EQUITY (USD $)	Total	Class A Equity [Member]	Class B Equity [Member]
Balance at Dec. 31, 2013	$ 814,221,000	$ 0	$ 814,221,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,790,000	0	6,790,000
Share-based compensation	3,530,000	0	3,530,000
Balance at Sep. 30, 2014	$ 824,541,000	$ 0	$ 824,541,000