Summary of Significant Accounting Policies - Total Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Accrued capital expenditures	$ 17,775	$ 20,494
Accrued incentive compensation	20,898	16,554
Accrued legal	0	7,000
Accrued severance	0	3,889
Accrued property taxes	3,175	3,699
Accrued other	9,104	6,367
TOTAL ACCRUED LIABILITIES	$ 50,952	$ 58,003