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Debt (Secured Tower Revenue Securities) (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Oct. 15, 2014 4.254% 2010-1 Tower Securities [Member] | Apr. 16, 2010 4.254% 2010-1 Tower Securities [Member] | Sep. 30, 2014 4.254% 2010-1 Tower Securities [Member] | Dec. 31, 2013 4.254% 2010-1 Tower Securities [Member] | Apr. 16, 2010 5.101% 2010-2 Tower Securities [Member] | Sep. 30, 2014 5.101% 2010-2 Tower Securities [Member] | Dec. 31, 2013 5.101% 2010-2 Tower Securities [Member] | Oct. 15, 2014 2010 Secured Tower Revenue Securities [Member] | Apr. 16, 2010 2010 Secured Tower Revenue Securities [Member] | Aug. 09, 2012 2.933% 2012-1 Tower Securities [Member] | Sep. 30, 2014 2.933% 2012-1 Tower Securities [Member] | Dec. 31, 2013 2.933% 2012-1 Tower Securities [Member] | Apr. 18, 2013 2.240% 2013-1C Tower Securities [Member] | Sep. 30, 2014 2.240% 2013-1C Tower Securities [Member] | Dec. 31, 2013 2.240% 2013-1C Tower Securities [Member] | Apr. 18, 2013 3.722% 2013-2C Tower Securities [Member] | Sep. 30, 2014 3.722% 2013-2C Tower Securities [Member] | Dec. 31, 2013 3.722% 2013-2C Tower Securities [Member] | Apr. 18, 2013 3.598% 2013-1D Tower Securities [Member] | Sep. 30, 2014 3.598% 2013-1D Tower Securities [Member] | Dec. 31, 2013 3.598% 2013-1D Tower Securities [Member] | Apr. 18, 2013 2013 Secured Tower Revenue Securities [Member] | Oct. 15, 2014 2.898% 2014-1C Tower Securities [Member] | Oct. 15, 2014 3.869% 2014-2C Tower Securities [Member] | Oct. 15, 2014 2014 Secured Tower Revenue Securities [Member] | Sep. 30, 2014 2014 Secured Tower Revenue Securities [Member] | Oct. 15, 2014 Revolving Credit Facility [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] | Apr. 29, 2009 4.0% Convertible Senior Notes [Member] | Sep. 30, 2014 4.0% Convertible Senior Notes [Member] | Dec. 31, 2013 4.0% Convertible Senior Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 680,000,000 |  |  | $ 550,000,000 |  |  |  |  | $ 610,000,000 |  |  | $ 425,000,000 |  |  | $ 575,000,000 |  |  | $ 330,000,000 |  |  | $ 1,330,000,000 | $ 920,000,000 | $ 620,000,000 |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 4.254% | 4.254% |  | 5.101% | 5.101% |  |  |  | 2.933% | 2.933% |  | 2.24% | 2.24% |  | 3.722% | 3.722% |  | 3.598% | 3.598% |  |  | 2.898% | 3.869% |  |  |  |  |  | 4.00% | 4.00% |
Debt instrument, weighted average interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.70% |  |  |  |  |  |  |  |  |  |  |  |  | 3.218% |  |  | 3.289% |  |  |  |  |  |  |
Repayment date of debt instrument |  |  |  |  |  |  | Apr. 15, 2015 |  |  | Apr. 17, 2017 |  |  |  |  | Dec. 15, 2017 |  |  | Apr. 16, 2018 |  |  | Apr. 17, 2023 |  |  | Apr. 16, 2018 |  |  |  | Oct. 15, 2019 | Oct. 15, 2024 |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  | Apr. 16, 2040 | Apr. 15, 2015 |  | Apr. 15, 2042 | Apr. 17, 2017 |  |  |  | Dec. 15, 2042 | Dec. 15, 2017 |  | Apr. 15, 2043 | Apr. 16, 2018 |  | Apr. 15, 2048 | Apr. 17, 2023 |  | Apr. 15, 2043 | Apr. 16, 2018 |  |  | Oct. 17, 2044 | Oct. 15, 2049 |  |  |  | May 09, 2017 |  | Oct. 01, 2014 | Oct. 01, 2014 |
Amortized deferred financing fees | 4,599,000 | 3,981,000 | 13,114,000 | 11,508,000 |  |  |  |  |  |  |  |  | 1,100,000 | 18,000,000 | 14,900,000 |  |  |  |  |  |  |  |  |  |  |  | 25,500,000 |  |  |  | 20,900,000 |  |  |  |  |  |
Weighted average life of debt instrument through the anticipated repayment date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years 2 months 12 days |  |  | 7 years |  |  |  |  |  |  |
Aggregate debt | 7,550,088,000 |  | 7,550,088,000 |  | 5,876,607,000 |  |  | 680,000,000 | 680,000,000 |  | 550,000,000 | 550,000,000 |  |  |  | 610,000,000 | 610,000,000 |  | 425,000,000 | 425,000,000 |  | 575,000,000 | 575,000,000 |  | 330,000,000 | 330,000,000 |  |  |  | 1,540,000,000 |  |  | 300,000,000 | 215,000,000 |  | 367,068,000 | 468,394,000
Repayments of long-term debt |  |  |  |  |  | $ 680,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |  |

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