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Debt (Schedule of Cash and Non-Cash Interest Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 09, 2018 | Oct. 13, 2017 | Apr. 17, 2017 | Aug. 15, 2016 | Jul. 07, 2016 | Oct. 14, 2015 | Jul. 01, 2014 | Sep. 28, 2012 | Jul. 13, 2012 | Apr. 16, 2010
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | $ 376,217 | $ 323,749 | $ 329,171 |  |  |  |  |  |  |  |  |  |
Non-cash Interest | 2,640 | 2,879 | 2,203 |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | $ 7,411 | 8,046 | 4,167 |  |  |  |  |  |  |  |  |  |
5.625% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest |  |  | $ 21,094 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.625% |  | 5.625% |  |  |  |  |  |  |  | 5.625% |  |
5.75% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest |  |  | $ 28,494 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 5.75% |  | 5.75% |  |  |  |  |  |  |  |  | 5.75% |
2014 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | $ 36,563 | 36,563 | $ 36,563 |  |  |  |  |  |  |  |  |  |
Non-cash Interest | 761 | 724 | 689 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  | 4.875% |  |  |
2016 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 53,625 | 53,625 | 20,258 |  |  |  |  |  |  |  |  |  |
Non-cash Interest | 1,003 | 954 | 348 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 4.875% |  |  |  |  |  |
2017 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 30,000 | 6,500 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 4.00% |  |  |  |  |  |  |  |
2010-2C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest |  |  | 15,213 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  |  |  |  |  | 5.101%
2012 Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest |  | 5,330 | 18,107 |  |  |  |  |  |  |  |  |  |
2013 Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 25,654 | 43,217 | 43,217 |  |  |  |  |  |  |  |  |  |
2014 Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 51,138 | 51,138 | 51,138 |  |  |  |  |  |  |  |  |  |
2015-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 15,939 | 15,939 | 15,939 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  |  | 3.156% |  |  |  |
2016-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 20,361 | 20,361 | 9,898 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  |  | 2.877% |  |  |  |  |
2017-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 24,354 | 17,182 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  | 3.168% |  |  |  |  |  |  |
2018-1C Tower Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 18,072 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 3.448% |  |  |  |  |  |  |  |  |
2014 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 15,550 | 49,414 | 48,962 |  |  |  |  |  |  |  |  |  |
Non-cash Interest | 146 | 525 | 510 |  |  |  |  |  |  |  |  |  |
2015 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 5,237 | 16,641 | 16,487 |  |  |  |  |  |  |  |  |  |
Non-cash Interest | 187 | 676 | 656 |  |  |  |  |  |  |  |  |  |
2018 Term Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | 72,648 |  |  |  |  |  |  |  |  |  |  |  |
Non-cash Interest | 543 |  |  |  |  |  |  |  |  |  |  |  |
Capitalized Interest And Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Interest | $ (335) | $ (207) | $ (366) |  |  |  |  |  |  |  |  |  |

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