Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for doubtful accounts	$ 18,770	$ 11,504
Revenue recognition (timing differences)	46,953	21,972
Net operating loss carryforwards	577	347
Excess Tax Benefit	3,510
Deferred Revenue	879
Other temporary differences	1,481	952
Total gross deferred taxes assets	72,170	34,775
Less: valuation allowance	(70,061)	(33,476)
Total deferred taxes assets	2,109	1,299
Deferred tax liabilities:
Fixed assets	1,789	1,008
Total gross deferred taxes liabilities	1,789	1,008
Net deferred taxes assets	$ 320	$ 291