Income Taxes - Reconciliation of Uncertain Tax Positions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Uncertain tax benefits at the beginning of the year	$ 12,695,000	$ 0	$ 0
Additions based on tax positions related to the current year	300,000	12,695,000	0
Additions for tax positions from prior years	379,000	0	0
Subtractions for tax positions from prior years	(44,000)	0	0
Uncertain tax benefits at the end of the year	$ 13,330,000	$ 12,695,000	$ 0