Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Beginning balance	$ 1,284	$ 1,360
Accretion of redeemable non-controlling interest	392	31
Net income attributable to non-controlling interest	324	58
Distribution to non-controlling interest	(281)	(165)
Redemption of non-controlling interest	(1,700)	0	0
Other	(19)	0
Ending balance	$ 0	$ 1,284	$ 1,360