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Quarterly Operating Results (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Sep. 07, 2012
Jun. 15, 2012
Mar. 23, 2012
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Data [Abstract]                      
Total revenue $ 201,467 $ 204,345 $ 218,013 $ 175,863 $ 178,628 $ 175,587 $ 113,440 $ 259,232 $ 799,688 $ 726,887 $ 600,083
Total operating expenses 179,975 183,400 186,646 174,509 198,185 153,720 118,544 227,984 724,530 698,433 562,206
Operating income 21,492 20,945 31,367 1,354 (19,557) 21,867 (5,104) 31,248 75,158 28,454 37,877
(Loss) income from continuing operations 6,828 7,679 14,120 (4,799) (31,171) 7,957 (10,477) 15,616 23,828 (18,075) (9,438)
Income (loss) from discontinued operations 22,727 885 952 673 (13,608) 987 13,092 1,012 25,237 1,483 1,760
Net (loss) income $ 29,555 $ 8,564 $ 15,072 $ (4,126) $ (44,779) $ 8,944 $ 2,615 $ 16,628 $ 49,065 $ (16,592) $ (7,678)
Basic and diluted (loss) earnings per share:                      
Continuing operations (in dollars per share) $ 0.03 $ 0.04 $ 0.07 $ (0.02) $ (0.17) $ 0.05 $ (0.06) $ 0.08 $ 0.12 $ (0.10) $ (0.06)
Discontinued operations (in dollars per share) $ 0.12 $ 0.00 $ 0.01 $ 0.00 $ (0.07) $ 0.00 $ 0.08 $ 0.01 $ 0.13 $ 0.01 $ 0.01
Basic and diluted loss per share (in dollars per share) $ 0.15 $ 0.04 $ 0.08 $ (0.02) $ (0.24) $ 0.05 $ 0.02 $ 0.09 $ 0.25 $ (0.09) $ (0.05)