Annual report pursuant to Section 13 and 15(d)

Supplemental Cash Flow Information (Details)

v3.6.0.2
Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]      
Cash paid during the period for interest, net of amounts capitalized $ 66,436 $ 122,860 $ 130,578
Non-cash conveyance of assets 0 13,169 0
Balance in property, plant and equipment, net funded with accounts payable and accrued liabilities $ 395,100 $ 301,400 $ 129,800