Annual report pursuant to Section 13 and 15(d)

Supplemental Cash Flow Information - Supplemental Cash Flow Information (Parenthetical) (Details)

v3.3.1.900
Supplemental Cash Flow Information - Supplemental Cash Flow Information (Parenthetical) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]      
Cash paid, interest capitalized $ 7,256 $ 8,526 $ 10,058