Supplemental Cash Flow Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Interest paid, net of amounts capitalized	$ 14,842	$ 18,387
Income taxes paid	125	61
Non-cash investing activities:
Property and equipment additions in accounts payable and accrued liabilities	16,571	17,168
Amortization of deferred financing fees in building and improvements, net	84	0
Non-cash financing activities:
Financing costs in accrued liabilities and payables to related parties		0
Unrealized Gain (Loss) on Derivatives	$ 4,556	$ 0