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Accrued Liabilities (Loss Reserve Activity) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Loss reserve on contractual lease commitments, beginning of period $ 10,629 $ 2,464 $ 2,464
Additions 0   (8,165)
Reductions 857   857
Loss reserve on contractual lease commitments, end of period $ 9,772 10,629 $ 9,772
Loss Reserve On Contractual Lease Commitments [Member]      
Additions   $ (8,165)