Noncontrolling Interests Redeemable Noncontrolling Interests Rollforward (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
Redeemable Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interests, Equity, Carrying Amount, Beginning of Period							$ 19,287								$ 21,691		$ 19,287	$ 21,691	$ 19,598
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
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders																	(3,416)	(3,851)	(2,149)
Noncontrolling Interest, Period Increase (Decrease)																	(351)	(205)	1,094
Redeemable Noncontrolling Interests, Equity, Carrying Amount, End of Period	19,468								19,287								19,468	19,287	21,691
DTC [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable Noncontrolling Interests, Equity, Carrying Amount, Beginning of Period							19,468										19,468
Redeemable Noncontrolling Interest Decrease, Sale of ownership interest																	0	(1,470)	0
Redeemable Noncontrolling Interests, Equity, Carrying Amount, End of Period									$ 19,468									$ 19,468

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