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Capitalized Interest (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Debt Disclosure [Abstract]    
Interest incurred $ 5,074 $ 4,348
Less: Amounts capitalized (5,074) (4,348)
Interest expense 0 0
Cash paid for interest 3,159 2,263
Amortization of financing costs and discounts $ 900 $ 1,000