Debt (Schedule of Cash and Non-Cash Interest Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Debt Instrument [Line Items]
Cash Interest	$ 90,095	$ 95,851
Non-cash Interest	$ 11,804	2,406
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	1.59%
Cash Interest	$ 2,148	2,714
2018 Term Loan [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	1.872%
Cash Interest	$ 10,997	22,203
Non-cash Interest	$ 11,434	2,022
Blended rate	1.872%
Accruing interest rate	1.86%
2013-2C Tower Securities [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	3.722%
Cash Interest	$ 5,396	5,396
2014-2C Tower Securities [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	3.869%
Cash Interest	$ 6,046	6,046
2015-1C Tower Securities [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	3.156%
Cash Interest		3,985
2016-1C Tower Securities [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	2.877%
Cash Interest		5,090
2017-1C Tower Securities [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	3.168%
Cash Interest	$ 6,085	6,085
2018-1C Tower Securities [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	3.448%
Cash Interest	$ 5,570	5,570
2019-1C Tower Securities [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	2.836%
Cash Interest	$ 8,357	8,357
2020-1C Tower Securities [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	1.884%
Cash Interest	$ 3,598
2020-2C Tower Securities [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	2.328%
Cash Interest	$ 3,540
2014 Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	4.875%
Cash Interest		3,352
Non-cash Interest		112
2016 Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	4.875%
Cash Interest	$ 13,406	13,406
Non-cash Interest	$ 286	272
2017 Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	4.00%
Cash Interest	$ 2,333	7,500
2020 Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	3.875%
Cash Interest	$ 14,531	6,135
Non-cash Interest	$ 84
2021 Senior Notes [Member]
Debt Instrument [Line Items]
Interest Rates as of March 31, 2021	3.125%
Cash Interest	$ 8,073
Other [Member]
Debt Instrument [Line Items]
Cash Interest	15	$ 12
Interest Rate Swap [Member] | 2018 Term Loan [Member]
Debt Instrument [Line Items]
Notional amount	$ 1,950,000
Derivative fixed interest rate	1.874%
Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member] | 2018 Term Loan [Member]
Debt Instrument [Line Items]
Derivative basis spread on variable interest rate	1.75%