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Equity-Method Investment (Equity-Method Investment Recorded in Consolidated Statements of Operations) (Details) - NMTC Program - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]        
Asset impairments to write investment down to fair value $ 0 $ 3,498 $ 0 $ 6,996
Our portion of the partnership’s operating losses 0 2,065 0 4,131
Non-cash interest expense related to the amortization of the discounted fair value of future equity contributions 0 62 0 154
Tax benefits and credits generated $ 0 $ 6,837 $ 0 $ 12,782