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Equity-Method Investments - Equity-method Investment Recorded in Consolidated Statements of Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]      
Tax benefits and credits generated $ 2,798 $ (10,138) $ (12,341)
NMTC Program      
Schedule of Equity Method Investments [Line Items]      
Asset impairments to write investment down to fair value 0 13,992 16,521
Our portion of the partnership’s operating losses 0 8,262 6,929
Non-cash interest expense related to the amortization of the discounted fair value of future equity contributions 0 185 674
Tax benefits and credits generated $ 0 $ 28,530 $ 30,831