Reconciliation of Equity (Net Assets) Attributable to the Noncontrolling Interests (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reconciliation of equity (net assets) attributable to the noncontrolling interests
Noncontrolling interests at beginning of period				$ 10,003
Non-redeembable Noncontrolling Interest in Variable Interest Entity	8,648		8,648
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest		259	0	514
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	182		438	0
Noncontrolling interests at end of period		9,489		9,489
Non-redeembable Noncontrolling Interest in Variable Interest Entity			$ 9,086