Noncontrolling Interests Components of Noncontrolling Interests (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Redeemable Noncontrolling Interest [Line Items]
Redeemable and Nonredeemable Noncontrolling Interest		$ 20,054	$ 21,481
Redeemable Noncontrolling Interests		16,938	18,088
Nonredeemable Noncontrolling Interest		3,116	3,393
Anchor [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable and Nonredeemable Noncontrolling Interest		11,725	11,907
BOS [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable and Nonredeemable Noncontrolling Interest		6,079	6,744
DGHM [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interests	[1]	2,250	2,830
Redeemable Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interests		16,938	18,088	$ 19,911	$ 20,905
Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Interest		$ 3,116	$ 3,393	$ 2,601	$ 386

[1] Only includes redeemable noncontrolling interests.