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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Information |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Quarter Ended
﻿ |  | December 31, |  | September 30, |  | June 30, |  | March 31,
﻿ |  | 2018 |  | 2018 |  | 2018 |  | 2018
﻿ |  | (in thousands, except per share amounts)
﻿Revenues |  | $ | 483,849 |  | $ | 467,221 |  | $ | 456,322 |  | $ | 458,303
﻿Operating income |  |  | 150,321 |  |  | 138,006 |  |  | 125,870 |  |  | 129,969
﻿Depreciation, accretion, and amortization |  |  | (169,454) |  |  | (167,703) |  |  | (169,558) |  |  | (165,398)
﻿Loss from extinguishment of debt, net |  |  | — |  |  | — |  |  | (13,798) |  |  | (645)
﻿Net income (loss) |  |  | 57,152 |  |  | 16,144 |  |  | (57,392) |  |  | 31,547
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Net income (loss) per common share - basic |  | $ | 0.50 |  | $ | 0.14 |  | $ | (0.50) |  | $ | 0.27
﻿Net income (loss) per common share - diluted |  |  | 0.50 |  |  | 0.14 |  |  | (0.50) |  |  | 0.27
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Quarter Ended
﻿ |  | December 31, |  | September 30, |  | June 30, |  | March 31,
﻿ |  | 2017 |  | 2017 |  | 2017 |  | 2017
﻿ |  | (in thousands, except per share amounts)
﻿Revenues |  | $ | 443,073 |  | $ | 433,945 |  | $ | 427,294 |  | $ | 423,362
﻿Operating income |  |  | 119,081 |  |  | 117,011 |  |  | 114,590 |  |  | 107,819
﻿Depreciation, accretion, and amortization |  |  | (162,643) |  |  | (161,907) |  |  | (159,520) |  |  | (159,030)
﻿Loss from extinguishment of debt, net |  |  | — |  |  | — |  |  | (1,961) |  |  | —
﻿Net income |  |  | 7,660 |  |  | 49,161 |  |  | 9,233 |  |  | 37,600
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿Net income per common share - basic (1) |  | $ | 0.07 |  | $ | 0.41 |  | $ | 0.08 |  | $ | 0.31
﻿Net income per common share - diluted |  |  | 0.06 |  |  | 0.41 |  |  | 0.08 |  |  | 0.31
﻿
| (1) |  | The sums of quarterly earnings per share data may not equal annual data due to rounding.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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