Goodwill and Intangible Assets (Components of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Amortizing intangible assets:
Gross Carrying Amount	$ 173,505	$ 178,372
Accumulated Amortization	(91,573)	(84,868)
Intangible Assets, net	81,932	93,504
Intangible assets not subject to amortization	33,427	33,427
Total other intangible assets	115,359	126,931
Customer contracts [Member]
Amortizing intangible assets:
Gross Carrying Amount	148,992	152,629
Accumulated Amortization	(73,833)	(68,380)
Intangible Assets, net	75,159	84,249
Other [Member]
Amortizing intangible assets:
Gross Carrying Amount	24,513	25,743
Accumulated Amortization	(17,740)	(16,488)
Intangible Assets, net	$ 6,773	$ 9,255