Acquisitions - Redeemable Noncontrolling Interest (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		7 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Feb. 23, 2012 Fair Value, Inputs, Level 3 [Member]
Redeemable Noncontrolling Interest [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value							$ 25,630
Distributions to noncontrolling interests			(820)
Net income attributable to redeemable noncontrolling interests	1,290	0	1,560	1,560	0
Redeemable noncontrolling interest, ending balance	$ 26,370		$ 26,370	$ 26,370		$ 0