CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts receivable, related parties	$ 6,155	$ 8,258
Prepaid expenses and other current assets, related parties	1,110	4,507
Accounts payable, related parties	8,593	13,480
Accrued liabilities, related parties	$ 2,107	$ 3,211
Class A
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	750,000,000	750,000,000
Common stock, issued (in shares)	57,026,226	52,586,899
Common stock, outstanding (in shares)	57,026,226	52,586,899
Class B
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	100,000,000	100,000,000
Common stock, issued (in shares)	10,948,832	15,346,981
Common stock, outstanding (in shares)	10,948,852	15,346,981