Quarterly report pursuant to Section 13 or 15(d)

Indebtedness Textuals (Details)

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Indebtedness Textuals (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument    
Letters of credit outstanding, amount $ 48,730 $ 100,613
Debt instrument, covenant compliance we were in compliance with these covenants