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Discontinued Operations Assets Held for Sale and Discontinued Operations (Assets held for sale and discontinued operations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]      
Revenues $ 0 $ 817 $ 4,164
Operating income 0 235 729
Impairment 0 (1,180) (100)
Net gain on disposal 0 1,594 6,091
Income tax provision 0 (257) (2,544)
Income from discontinued operations, net of tax $ 0 $ 392 $ 4,176