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Debt (Senior Notes) (Narrative) (Details) $ in Thousands |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 13, 2017 USD ($) | Oct. 03, 2016 USD ($) | Oct. 01, 2016 USD ($) | Aug. 15, 2016 USD ($) | Jul. 01, 2014 USD ($) | Jan. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 28, 2012 USD ($) | Jul. 13, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of revolving credit facility |  |  |  |  |  |  | $ 835,000 | $ 875,000 | $ 190,000 |  |
5.75% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  |  |  |  |  |  |  |  |  |  | $ 800,000
Debt instrument, maturity date |  |  |  |  |  |  | Jul. 15, 2020 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 5.75% |  | 5.75% |  | 5.75%
Financing fees |  |  |  |  |  |  |  |  |  |  | $ 14,000
Repayments of unsecured debt |  |  |  | $ 800,000 |  |  |  |  |  |  |
Debt call premium |  |  |  | 25,800 |  |  |  |  |  |  |
Write-off of deferred financing fees |  |  |  | 7,700 |  |  |  |  |  |  |
5.75% Senior Notes [Member] | Telecommunications [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 100.00% |  |  |  |
5.625% Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  |  |  |  |  |  |  |  |  | $ 500,000 |
Debt instrument, maturity date |  |  |  |  |  |  | Oct. 01, 2019 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 5.625% |  | 5.625% | 5.625% |
Interest payable dates |  |  |  |  |  |  | April 1 and October 1 |  |  |  |
Accrued interest |  | $ 14,100 |  |  |  |  |  |  |  |  |
Financing fees |  |  |  |  |  |  |  |  |  | $ 8,600 |
Repayments of unsecured debt |  | 500,000 |  | 250,000 |  |  |  |  |  |  |
Debt call premium |  | $ 14,100 |  |  |  |  |  |  |  |  |
Write-off of deferred financing fees |  |  | $ 4,100 |  |  |  |  |  |  |  |
2014 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  |  |  |  | $ 750,000 |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Jul. 15, 2022 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 4.875% |  |  |  |  |  |
Percentage of face value price for issuance of senior notes |  |  |  |  | 99.178% |  |  |  |  |  |
Interest payable dates |  |  |  |  |  |  | January 15 and July 15 |  |  |  |
Financing fees |  |  |  |  | $ 11,600 |  |  |  |  |  |
2014 Senior Notes [Member] | Redemption, Period Three [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 101.219% |  |  |  |
2014 Senior Notes [Member] | Redemption, Period Four [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 100.00% |  |  |  |
2016 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes |  |  |  | $ 1,100,000 |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Sep. 01, 2024 |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  | 4.875% |  |  |  |  |  |  |
Percentage of face value price for issuance of senior notes |  |  |  | 99.178% |  |  |  |  |  |  |
Interest payable dates |  |  |  |  |  |  | March 1 and September 1 |  |  |  |
Financing fees |  |  |  | $ 12,800 |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 104.875% |  |  |  |
Aggregate redemption price, percentage |  |  |  |  |  |  | 35.00% |  |  |  |
2016 Senior Notes [Member] | Redemption, Period One [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 103.656% |  |  |  |
2016 Senior Notes [Member] | Redemption, Period Two [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 102.438% |  |  |  |
2016 Senior Notes [Member] | Redemption, Period Three [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 101.219% |  |  |  |
2016 Senior Notes [Member] | Redemption, Period Four [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 100.00% |  |  |  |
2017 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unsecured senior notes | $ 750,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date | Oct. 01, 2022 |  |  |  |  |  | Oct. 01, 2022 |  |  |  |
Debt instrument, interest rate, stated percentage | 4.00% |  |  |  |  |  |  |  |  |  |
Interest payable dates |  |  |  |  |  |  | April 1 and October 1 |  |  |  |
Financing fees | $ 8,900 |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 104.00% |  |  |  |
Aggregate redemption price, percentage |  |  |  |  |  |  | 35.00% |  |  |  |
2017 Senior Notes [Member] | Redemption, Period Two [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 102.00% |  |  |  |
2017 Senior Notes [Member] | Redemption, Period Three [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 100.00% |  |  |  |
2017 Senior Notes [Member] | Redemption, Period Four [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage |  |  |  |  |  |  | 101.00% |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ratio of indebtedness to annualized consolidated adjusted EBITDA |  |  |  |  |  |  | 9.5 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Apr. 11, 2023 |  |  |  |
Repayments of revolving credit facility | $ 460,000 |  |  |  |  |  | $ 835,000 |  |  |  |
Revolving Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayments of revolving credit facility |  |  |  |  |  | $ 120,000 |  |  |  |  |

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