Annual report pursuant to Section 13 and 15(d)

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

v2.4.1.9
Supplemental Cash Flow Information - Supplemental Cash Flow Information (Parenthetical) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract]      
Cash paid, interest capitalized $ 8,526us-gaap_InterestCostsCapitalizedAdjustment $ 10,058us-gaap_InterestCostsCapitalizedAdjustment $ 13,274us-gaap_InterestCostsCapitalizedAdjustment