Noncontrolling Interests Components of Noncontrolling Interests (Details) - USD ($) $ in Thousands		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Redeemable Noncontrolling Interest [Line Items]
Redeemable and Nonredeemable Noncontrolling Interest		$ 19,222		$ 21,481
Redeemable Noncontrolling Interests		15,843		18,088
Nonredeemable Noncontrolling Interest		3,379		3,393
Anchor [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable and Nonredeemable Noncontrolling Interest		10,791		11,907
BOS [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable and Nonredeemable Noncontrolling Interest		6,080		6,744
DGHM [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interests	[1]	2,351		2,830
Redeemable Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interests		15,843	$ 16,938	18,088	$ 19,200	$ 19,911	$ 20,905
Noncontrolling Interest [Member]
Redeemable Noncontrolling Interest [Line Items]
Nonredeemable Noncontrolling Interest		$ 3,379	$ 3,116	$ 3,393	$ 2,896	$ 2,601	$ 386

[1] Only includes redeemable noncontrolling interests.