Quarterly report pursuant to Section 13 or 15(d)

Supplemental Cash Flow Information (Details)

v3.8.0.1
Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Supplemental Cash Flow Information [Abstract]    
Costs relating to construction included in accounts payable and accrued expenses $ 18,978 $ 26,923
Interest Paid, Net $ 15,903 $ 9,445