Noncontrolling Interests Text Details (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Noncontrolling Interest	$ 1,178	[1]	$ 871	[1]	$ 969	[1]	$ 930	[1]	$ 715	[1]	$ 855	[1]	$ 759	[1]	$ 793	[1]	$ 3,948	$ 3,122	$ 3,148
Redeemable noncontrolling interests	19,468								19,287								19,468	19,287	21,691	19,598
Stockholders' Equity Attributable to Noncontrolling Interest	19,639								19,287								19,639	19,287
Nonredeemable Noncontrolling Interest	171								0								171	0
Anchor [Member]
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	11,533								11,105								11,533	11,105
BOS [Member]
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	5,337								5,782								5,337	5,782
DGHM [Member]
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	2,769								2,400								2,769	2,400
DTC [Member]
Noncontrolling Interest [Line Items]
Redeemable noncontrolling interests									$ 19,468									$ 19,468

[1] Due to rounding, the sum of the four quarters may not add to the year to date total.