Assets Held For Sale Assets Held for Sale (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Long Lived Assets Held-for-sale [Line Items]
Assets Held-for-sale, Long Lived	$ 4,089	$ 4,089	$ 6,074
Proceeds from Sale of Property, Plant, and Equipment	31,908	33,239
Gain (Loss) on Disposition of Property	$ 29,494	$ 30,764