Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 9,261	$ 2,272
Common stock - par value (USD per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	375,000,000	375,000,000
Common stock, shares issued (in shares)	76,786,000	74,843,470
Common stock, shares outstanding (in shares)	76,786,000	74,843,470
Treasury stock, shares held (in shares)	2,948,995	4,991,858