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Quarterly Financial Data (Schedule of Quarterly Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Data [Abstract]                      
Revenues $ 483,849 $ 467,221 $ 456,322 $ 458,303 $ 443,073 $ 433,945 $ 427,294 $ 423,362 $ 1,865,695 $ 1,727,674 $ 1,633,125
Operating income 150,321 138,006 125,870 129,969 119,081 117,011 114,590 107,819 544,166 458,501 387,308
Depreciation, accretion, and amortization (169,454) (167,703) (169,558) (165,398) (162,643) (161,907) (159,520) (159,030) (672,113) (643,100) (638,189)
Loss from extinguishment of debt, net     (13,798) (645)     (1,961)   (14,087) (1,961) (52,701)
Net income (loss) $ 57,152 $ 16,144 $ (57,392) $ 31,547 $ 7,660 $ 49,161 $ 9,233 $ 37,600 $ 47,451 $ 103,654 $ 76,238
Net income per common share - basic $ 0.50 $ 0.14 $ (0.50) $ 0.27 $ 0.07 $ 0.41 $ 0.08 $ 0.31 $ 0.41 $ 0.86 $ 0.61
Net income per common share - diluted $ 0.50 $ 0.14 $ (0.50) $ 0.27 $ 0.06 $ 0.41 $ 0.08 $ 0.31 $ 0.41 $ 0.86 $ 0.61