Quarterly report pursuant to Section 13 or 15(d)

Supplemental Cash Flow Information (Details)

v3.10.0.1
Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Supplemental Cash Flow Information [Abstract]    
Costs relating to construction included in accounts payable and accrued expenses $ 15,187 $ 24,679
Interest paid, net of interest capitalized $ 30,074 $ 31,212