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v3.20.2

Basis of Presentation and Other Information - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Prepaid expenses and other |  | $ 56,392 | $ 60,527 |  | $ 56,392 |  | $ 60,527
Retained earnings |  | 472,537 | 430,010 |  | 472,537 |  | 430,010
Property, plant and equipment, net |  | 703,012 | 701,514 |  | 703,012 |  | 701,514
Deferred income taxes |  | 144,273 | 137,567 |  | 144,273 |  | 137,567
Depreciation expense |  | 34,832 |  | $ 42,353 | 71,743 | $ 83,532 |
Income tax expense |  | 10,284 |  | 4,524 | 14,576 | 8,734 |
Net income |  | $ 29,247 |  | $ 13,150 | $ 42,527 | $ 27,060 |
Increase (decrease) in earnings per share, basic (in dollars per share) |  | $ 0.59 |  | $ 0.26 | $ 0.85 | $ 0.54 |
Increase (decrease) in earnings per share, diluted (in dollars per share) |  | $ 0.58 |  | $ 0.26 | $ 0.85 | $ 0.54 |
Affiliated Entity |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Negotiation period | 90 days |  |  |  |  |  |
Option to purchase assets, period | 60 days |  |  |  |  |  |
Purchase option, value of business percentage | 90.00% |  |  |  |  |  |
Option to purchase network, period | 60 days |  |  |  |  |  |
Revision of Prior Period, Error Correction, Adjustment | Prior Period Errors |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |
Prepaid expenses and other |  |  | 2,700 |  |  |  | 2,700
Deferred tax liabilities, net |  |  | 700 |  |  |  | 700
Retained earnings |  |  | 2,000 |  |  |  | 2,000
Property, plant and equipment, net |  |  | 1,400 |  |  |  | 1,400
Deferred income taxes |  |  | 400 |  |  |  | 400
Depreciation expense |  |  | (1,400) |  |  |  | (1,400)
Income tax expense |  |  | 400 |  |  |  | 400
Net income |  |  | $ 1,000 |  |  |  | $ 1,000
Increase (decrease) in earnings per share, basic (in dollars per share) |  |  | $ 0.02 |  |  |  | $ 0.02
Increase (decrease) in earnings per share, diluted (in dollars per share) |  |  | $ 0.02 |  |  |  | $ 0.02

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