Consolidated and Combined Statements of Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Interest rate swaps, tax	$ 1,016
Capitalized swap interest, tax	358
Accumulated Other Comprehensive Income (Loss)
Interest rate swaps, tax	1,016
Capitalized swap interest, tax	$ 358