Noncontrolling Interests Redeemable Noncontrolilng Interests Rollforward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests at beginning of year				$ 21,691		$ 19,598
Net income/ (loss) attributable to noncontrolling interests	855		740	2,407		2,265
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders				(3,168)		(1,428)
Noncontrolling Interest, adjustment to fair value				215		1,450
Redeemable noncontrolling interests at end of period	19,675		21,885	19,675		21,885
DTC [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests at beginning of year				1,924	[1]
Redeemable Noncontrolling Interest Decrease, Sale of ownership interest				(1,470)		0
Redeemable noncontrolling interests at end of period	$ 0	[1]		$ 0	[1]

[1] In the second quarter of 2012, the Company completed the sale of its affiliate DTC.