Quarterly Financial Information (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 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
Revenue	$ 233,396	$ 235,989	$ 234,500	$ 235,469	$ 239,670	$ 242,052	$ 243,453	$ 248,474
Gain on sale of discontinued operations, net of taxes	0	0	0	10,044
Net (loss) income	$ 6,103	$ (8,960)	$ (43,108)	$ (47,485)	$ (32,180)	$ (37,329)	$ (37,073)	$ (46,712)
Income (Loss) from Continuing Operations, Per Basic Share (USD per share)	$ 0.23	$ (0.34)	$ (1.64)	$ (2.20)
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share (USD per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.38
Earnings Per Share, Basic (USD per share)	$ 0.23	$ (0.34)	$ (1.64)	$ (1.82)	$ (1.24)	$ (1.44)	$ (1.43)	$ (1.80)
Income (Loss) from Continuing Operations, Per Diluted Share (USD per share)	$ 0.23	$ (0.34)	$ (1.64)	$ (2.20)
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share (USD per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.38
Earnings Per Share, Diluted (USD per share)	$ 0.23	$ (0.34)	$ (1.64)	$ (1.82)	$ (1.24)	$ (1.44)	$ (1.43)	$ (1.80)