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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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- Definition

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- Definition

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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