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Debt (Schedule of Principal Values, Fair Values, and Carrying Values of Debt) (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 11, 2018 | Mar. 09, 2018 | Oct. 13, 2017 | Apr. 17, 2017 | Jul. 07, 2016 | Oct. 14, 2015 | Oct. 15, 2014 | Apr. 18, 2013 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Principal Balance |  |  |  |  |  |  |  |  | $ 10,028,000 | $ 9,405,000
Fair Value |  |  |  |  |  |  |  |  | 9,736,246 | 9,436,290
Carrying Value |  |  |  |  |  |  |  |  | 9,938,553 | 9,310,686
Less: current maturities of long-term debt |  |  |  |  |  |  |  |  | (941,728) | (20,000)
Total long-term debt, net of current maturities |  |  |  |  |  |  |  |  | $ 8,996,825 | 9,290,686
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Apr. 11, 2023 |
Principal Balance |  |  |  |  |  |  |  |  | $ 325,000 | 40,000
Fair Value |  |  |  |  |  |  |  |  | 325,000 | 40,000
Carrying Value |  |  |  |  |  |  |  |  | $ 325,000 | 40,000
2014 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Jul. 15, 2022 |
Principal Balance |  |  |  |  |  |  |  |  | $ 750,000 | 750,000
Fair Value |  |  |  |  |  |  |  |  | 735,000 | 770,625
Carrying Value |  |  |  |  |  |  |  |  | $ 741,273 | 739,079
2016 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Sep. 01, 2024 |
Principal Balance |  |  |  |  |  |  |  |  | $ 1,100,000 | 1,100,000
Fair Value |  |  |  |  |  |  |  |  | 1,034,000 | 1,127,500
Carrying Value |  |  |  |  |  |  |  |  | $ 1,083,689 | 1,081,262
2017 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  | Oct. 01, 2022 |  |  |  |  |  | Oct. 01, 2022 |
Principal Balance |  |  |  |  |  |  |  |  | $ 750,000 | 750,000
Fair Value |  |  |  |  |  |  |  |  | 712,500 | 750,938
Carrying Value |  |  |  |  |  |  |  |  | $ 743,099 | 741,437
2013-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  | Apr. 09, 2043 | Apr. 10, 2018 |
Principal Balance |  |  |  |  |  |  |  |  |  | 425,000
Fair Value |  |  |  |  |  |  |  |  |  | 423,853
Carrying Value |  |  |  |  |  |  |  |  |  | 424,482
2013-2C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  | Apr. 09, 2048 | Apr. 11, 2023 |
Principal Balance |  |  |  |  |  |  |  |  | $ 575,000 | 575,000
Fair Value |  |  |  |  |  |  |  |  | 569,164 | 578,433
Carrying Value |  |  |  |  |  |  |  |  | $ 569,715 | 568,609
2013-1D Tower Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  | Apr. 09, 2043 | Apr. 10, 2018 |
Principal Balance |  |  |  |  |  |  |  |  |  | 330,000
Fair Value |  |  |  |  |  |  |  |  |  | 330,145
Carrying Value |  |  |  |  |  |  |  |  |  | 329,585
2014-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Oct. 11, 2044 |  | Oct. 08, 2019 |
Principal Balance |  |  |  |  |  |  |  |  | $ 920,000 | 920,000
Fair Value |  |  |  |  |  |  |  |  | 914,241 | 915,216
Carrying Value |  |  |  |  |  |  |  |  | $ 917,728 | 914,929
2014-2C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Oct. 08, 2049 |  | Oct. 08, 2024 |
Principal Balance |  |  |  |  |  |  |  |  | $ 620,000 | 620,000
Fair Value |  |  |  |  |  |  |  |  | 609,665 | 620,942
Carrying Value |  |  |  |  |  |  |  |  | $ 614,315 | 613,461
2015-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  | Oct. 10, 2045 |  |  | Oct. 08, 2020 |
Principal Balance |  |  |  |  |  |  |  |  | $ 500,000 | 500,000
Fair Value |  |  |  |  |  |  |  |  | 496,640 | 496,840
Carrying Value |  |  |  |  |  |  |  |  | $ 495,737 | 493,474
2016-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | Jul. 10, 2046 |  |  |  | Jul. 09, 2021 |
Principal Balance |  |  |  |  |  |  |  |  | $ 700,000 | 700,000
Fair Value |  |  |  |  |  |  |  |  | 691,432 | 691,166
Carrying Value |  |  |  |  |  |  |  |  | $ 694,994 | 693,118
2017-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  | Apr. 09, 2047 |  |  |  |  | Apr. 11, 2022 |
Principal Balance |  |  |  |  |  |  |  |  | $ 760,000 | 760,000
Fair Value |  |  |  |  |  |  |  |  | 744,496 | 751,404
Carrying Value |  |  |  |  |  |  |  |  | $ 753,028 | 751,076
2018-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  | Mar. 09, 2048 |  |  |  |  |  |  | Mar. 09, 2023 |
Principal Balance |  |  |  |  |  |  |  |  | $ 640,000 |
Fair Value |  |  |  |  |  |  |  |  | 641,478 |
Carrying Value |  |  |  |  |  |  |  |  | $ 632,725 |
2014 Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Mar. 24, 2021 |
Principal Balance |  |  |  |  |  |  |  |  |  | 1,447,500
Fair Value |  |  |  |  |  |  |  |  |  | 1,451,119
Carrying Value |  |  |  |  |  |  |  |  |  | 1,439,373
2015 Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Jun. 10, 2022 |
Principal Balance |  |  |  |  |  |  |  |  |  | 487,500
Fair Value |  |  |  |  |  |  |  |  |  | 488,109
Carrying Value |  |  |  |  |  |  |  |  |  | $ 480,801
2018 Term Loan [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date | Apr. 11, 2025 |  |  |  |  |  |  |  | Apr. 11, 2025 |
Principal Balance |  |  |  |  |  |  |  |  | $ 2,388,000 |
Fair Value |  |  |  |  |  |  |  |  | 2,262,630 |
Carrying Value |  |  |  |  |  |  |  |  | $ 2,367,250 |

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