Segments (Reconciliation of reportable segment adjusted EBITDA) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Information [Line Items]
Less depreciation and amortization expense	$ (45,157)	$ (41,705)	$ (135,563)	$ (127,843)
Less software impairment charge	(2,571)	0	(29,839)	0
Less share-based compensation expense			(8,074)	(6,124)
Consolidated operating income	45,549	49,336	85,622	118,015
Less other expense, net	(18,058)	(18,411)	(97,561)	(55,938)
Consolidated income (loss) before income taxes	27,491	30,925	(11,939)	62,077
Segment Reconciling Items [Member]
Segment Reporting Information [Line Items]
Reportable segment Adjusted EBITDA	96,602	93,194	260,035	252,462
Less depreciation and amortization expense	(45,157)	(41,705)	(135,563)	(127,843)
Less software impairment charge	(2,571)	0	(29,839)	0
Less share-based compensation expense	(2,660)	(2,153)	(8,074)	(6,124)
Less accretion expense	(191)	(359)	(992)	(961)
Other	$ (474)	$ 359	$ 55	$ 481