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Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Quarterly Financial Data | 19.QUART ERLY FINANCIAL DATA (unaudited)
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | 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.
﻿ Basic and diluted net income (loss) per share is computed by dividing net income (loss) by the weighted average number of shares for the period. Potentially dilutive instruments have been excluded from the computation of diluted loss per share as their impact would have been anti-dilutive. ﻿ Because net income (loss) per share amounts are calculated using the weighted average number of common and dilutive common shares outstanding during each quarter, the sum of the per share amounts for the four quarters may not equal the total loss per share amounts for the year.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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