CONSOLIDATED AND COMBINED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Comprehensive income (loss), net of tax:
Net income (loss)	$ (127,543)		$ 148,470		$ (69,230)
Other comprehensive income (loss):
Interest rate swaps	(2,770)	[1]	(3,351)	[1]
Capitalized swap interest	(1,227)	[2]	(600)	[2]
Pension plan adjustment					117
Other comprehensive income (loss)	(3,997)		(3,951)		117
Comprehensive income (loss)	(131,540)		144,519		(69,113)
Comprehensive income attributable to noncontrolling interests	(745)		(1,290)		(201)
Comprehensive income (loss) attributable to common stockholders	$ (132,285)		$ 143,229		$ (69,314)

[1] Net of deferred taxes of $0.1 million and $1.0 million for the years ended December 31, 2012 and 2011, respectively.

[2] Net of deferred taxes of $0.7 million and $0.4 million for the years ended December 31, 2012 and 2011, respectively.