Redeemable Non-Controlling Interest (Temporary Equity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Redeemable Non Controlling Interest (Temporary Equity) (Additional Textual) [Abstract]
Reclassification of redeemable non-controlling interest to mandatorily redeemable equity interests			$ 6,071	$ 3,536
Distributions to redeemable non-controlling interest		43	789
Contributions to redeemable non controlling interest	20
Distributions to mandatorily redeemable equity interests	$ 8,299		$ 8,299		$ 3,149
Minimum [Member]
Redeemable Non-Controlling Interest (Temporary Equity) (Textual) [Abstract]
Mandatorily redeemable equity interests duration, years			2 years
Maximum [Member]
Redeemable Non-Controlling Interest (Temporary Equity) (Textual) [Abstract]
Mandatorily redeemable equity interests duration, years			5 years