Acquisitions and Divestitures Divestitures (Schedule of Selected Financial Information) (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
Discontinued Operations and Disposal Groups [Abstract]
Assets of Disposal Group, Including Discontinued Operation, Current					$ 14,015					$ 14,015
Disposal Group, Including Discontinued Operation, Revenue									593,733	702,695	651,872
Disposal Group, Including Discontinued Operation, Operating Expense									592,505	703,715	651,997
Disposal Group, Including Discontinued Operation, Operating Income (Loss)									1,228	(1,020)	(125)
Disposal Group, Including Discontinued Operation, Interest Income									2	2	3
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax									1,230	(1,018)	(122)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax									875	0	0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	1,164	508	290	143	(55)	(116)	(444)	(403)	2,105	(1,018)	(122)
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net					20					20
Liabilities of Disposal Group, Including Discontinued Operation, Current					$ 9,215					$ 9,215