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Fair Value Measurements (Summary Of Fair Values, Principal Balances, And Carrying Values Of Company's Debt Instruments) (Details) (USD $) In Thousands, unless otherwise specified |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  | 0 Months Ended | 9 Months Ended |  |  |  |  |  |  | 0 Months Ended | 9 Months Ended |  |  |  |  |  |  | 9 Months Ended |  |  |  |  |  |  | 9 Months Ended |  | 9 Months Ended |  |  |  |  |  |  | 9 Months Ended |  | 0 Months Ended | 9 Months Ended |  |
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Sep. 30, 2014 Fair Value [Member] | Dec. 31, 2013 Fair Value [Member] | Sep. 30, 2014 Principal Balance [Member] | Dec. 31, 2013 Principal Balance [Member] | Sep. 30, 2014 Carrying Value [Member] | Dec. 31, 2013 Carrying Value [Member] | Sep. 30, 2014 1.875% Convertible Senior Notes [Member] | Apr. 29, 2009 4.0% Convertible Senior Notes [Member] | Sep. 30, 2014 4.0% Convertible Senior Notes [Member] | Sep. 30, 2014 4.0% Convertible Senior Notes [Member] Fair Value [Member] | Dec. 31, 2013 4.0% Convertible Senior Notes [Member] Fair Value [Member] | Sep. 30, 2014 4.0% Convertible Senior Notes [Member] Principal Balance [Member] | Dec. 31, 2013 4.0% Convertible Senior Notes [Member] Principal Balance [Member] | Sep. 30, 2014 4.0% Convertible Senior Notes [Member] Carrying Value [Member] | Dec. 31, 2013 4.0% Convertible Senior Notes [Member] Carrying Value [Member] | Jul. 24, 2009 8.25% Senior Notes [Member] | Sep. 30, 2014 8.25% Senior Notes [Member] | Dec. 31, 2013 8.25% Senior Notes [Member] Fair Value [Member] | Dec. 31, 2013 8.25% Senior Notes [Member] Principal Balance [Member] | Dec. 31, 2013 8.25% Senior Notes [Member] Carrying Value [Member] | Sep. 28, 2012 5.625% Senior Notes [Member] | Sep. 30, 2014 5.625% Senior Notes [Member] | Sep. 30, 2014 5.625% Senior Notes [Member] Fair Value [Member] | Dec. 31, 2013 5.625% Senior Notes [Member] Fair Value [Member] | Sep. 30, 2014 5.625% Senior Notes [Member] Principal Balance [Member] | Dec. 31, 2013 5.625% Senior Notes [Member] Principal Balance [Member] | Sep. 30, 2014 5.625% Senior Notes [Member] Carrying Value [Member] | Dec. 31, 2013 5.625% Senior Notes [Member] Carrying Value [Member] | Jul. 13, 2012 5.75% Senior Notes [Member] | Sep. 30, 2014 5.75% Senior Notes [Member] | Sep. 30, 2014 5.75% Senior Notes [Member] Fair Value [Member] | Dec. 31, 2013 5.75% Senior Notes [Member] Fair Value [Member] | Sep. 30, 2014 5.75% Senior Notes [Member] Principal Balance [Member] | Dec. 31, 2013 5.75% Senior Notes [Member] Principal Balance [Member] | Sep. 30, 2014 5.75% Senior Notes [Member] Carrying Value [Member] | Dec. 31, 2013 5.75% Senior Notes [Member] Carrying Value [Member] | Jul. 01, 2014 4.875% Senior Notes [Member] | Sep. 30, 2014 4.875% Senior Notes [Member] | Jul. 01, 2014 4.875% Senior Notes [Member] | Sep. 30, 2014 4.875% Senior Notes [Member] Fair Value [Member] | Sep. 30, 2014 4.875% Senior Notes [Member] Principal Balance [Member] | Sep. 30, 2014 4.875% Senior Notes [Member] Carrying Value [Member] | Apr. 16, 2010 4.254% 2010-1 Tower Securities [Member] | Sep. 30, 2014 4.254% 2010-1 Tower Securities [Member] | Sep. 30, 2014 4.254% 2010-1 Tower Securities [Member] Fair Value [Member] | Dec. 31, 2013 4.254% 2010-1 Tower Securities [Member] Fair Value [Member] | Sep. 30, 2014 4.254% 2010-1 Tower Securities [Member] Principal Balance [Member] | Dec. 31, 2013 4.254% 2010-1 Tower Securities [Member] Principal Balance [Member] | Sep. 30, 2014 4.254% 2010-1 Tower Securities [Member] Carrying Value [Member] | Dec. 31, 2013 4.254% 2010-1 Tower Securities [Member] Carrying Value [Member] | Apr. 16, 2010 5.101% 2010-2 Tower Securities [Member] | Sep. 30, 2014 5.101% 2010-2 Tower Securities [Member] | Sep. 30, 2014 5.101% 2010-2 Tower Securities [Member] Fair Value [Member] | Dec. 31, 2013 5.101% 2010-2 Tower Securities [Member] Fair Value [Member] | Sep. 30, 2014 5.101% 2010-2 Tower Securities [Member] Principal Balance [Member] | Dec. 31, 2013 5.101% 2010-2 Tower Securities [Member] Principal Balance [Member] | Sep. 30, 2014 5.101% 2010-2 Tower Securities [Member] Carrying Value [Member] | Dec. 31, 2013 5.101% 2010-2 Tower Securities [Member] Carrying Value [Member] | Aug. 09, 2012 2.933% 2012-1 Tower Securities [Member] | Sep. 30, 2014 2.933% 2012-1 Tower Securities [Member] | Sep. 30, 2014 2.933% 2012-1 Tower Securities [Member] Fair Value [Member] | Dec. 31, 2013 2.933% 2012-1 Tower Securities [Member] Fair Value [Member] | Sep. 30, 2014 2.933% 2012-1 Tower Securities [Member] Principal Balance [Member] | Dec. 31, 2013 2.933% 2012-1 Tower Securities [Member] Principal Balance [Member] | Sep. 30, 2014 2.933% 2012-1 Tower Securities [Member] Carrying Value [Member] | Dec. 31, 2013 2.933% 2012-1 Tower Securities [Member] Carrying Value [Member] | Apr. 18, 2013 2.240% 2013-1C Tower Securities [Member] | Sep. 30, 2014 2.240% 2013-1C Tower Securities [Member] | Sep. 30, 2014 2.240% 2013-1C Tower Securities [Member] Fair Value [Member] | Dec. 31, 2013 2.240% 2013-1C Tower Securities [Member] Fair Value [Member] | Sep. 30, 2014 2.240% 2013-1C Tower Securities [Member] Principal Balance [Member] | Dec. 31, 2013 2.240% 2013-1C Tower Securities [Member] Principal Balance [Member] | Sep. 30, 2014 2.240% 2013-1C Tower Securities [Member] Carrying Value [Member] | Dec. 31, 2013 2.240% 2013-1C Tower Securities [Member] Carrying Value [Member] | Apr. 18, 2013 3.722% 2013-2C Tower Securities [Member] | Sep. 30, 2014 3.722% 2013-2C Tower Securities [Member] | Sep. 30, 2014 3.722% 2013-2C Tower Securities [Member] Fair Value [Member] | Dec. 31, 2013 3.722% 2013-2C Tower Securities [Member] Fair Value [Member] | Sep. 30, 2014 3.722% 2013-2C Tower Securities [Member] Principal Balance [Member] | Dec. 31, 2013 3.722% 2013-2C Tower Securities [Member] Principal Balance [Member] | Sep. 30, 2014 3.722% 2013-2C Tower Securities [Member] Carrying Value [Member] | Dec. 31, 2013 3.722% 2013-2C Tower Securities [Member] Carrying Value [Member] | Apr. 18, 2013 3.598% 2013-1D Tower Securities [Member] | Sep. 30, 2014 3.598% 2013-1D Tower Securities [Member] | Sep. 30, 2014 3.598% 2013-1D Tower Securities [Member] Fair Value [Member] | Dec. 31, 2013 3.598% 2013-1D Tower Securities [Member] Fair Value [Member] | Sep. 30, 2014 3.598% 2013-1D Tower Securities [Member] Principal Balance [Member] | Dec. 31, 2013 3.598% 2013-1D Tower Securities [Member] Principal Balance [Member] | Sep. 30, 2014 3.598% 2013-1D Tower Securities [Member] Carrying Value [Member] | Dec. 31, 2013 3.598% 2013-1D Tower Securities [Member] Carrying Value [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Fair Value [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] Fair Value [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Principal Balance [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] Principal Balance [Member] | Sep. 30, 2014 Revolving Credit Facility [Member] Carrying Value [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] Carrying Value [Member] | Sep. 30, 2014 2011 Term Loan [Member] | Dec. 31, 2013 2011 Term Loan [Member] Fair Value [Member] | Dec. 31, 2013 2011 Term Loan [Member] Principal Balance [Member] | Dec. 31, 2013 2011 Term Loan [Member] Carrying Value [Member] | Sep. 30, 2014 2012-1 Term Loan [Member] | Sep. 30, 2014 2012-1 Term Loan [Member] Fair Value [Member] | Dec. 31, 2013 2012-1 Term Loan [Member] Fair Value [Member] | Sep. 30, 2014 2012-1 Term Loan [Member] Principal Balance [Member] | Dec. 31, 2013 2012-1 Term Loan [Member] Principal Balance [Member] | Sep. 30, 2014 2012-1 Term Loan [Member] Carrying Value [Member] | Dec. 31, 2013 2012-1 Term Loan [Member] Carrying Value [Member] | Sep. 30, 2014 2012-2 Term Loan [Member] | Dec. 31, 2013 2012-2 Term Loan [Member] Fair Value [Member] | Dec. 31, 2013 2012-2 Term Loan [Member] Principal Balance [Member] | Dec. 31, 2013 2012-2 Term Loan [Member] Carrying Value [Member] | Feb. 07, 2014 2014 Term Loan [Member] | Sep. 30, 2014 2014 Term Loan [Member] | Sep. 30, 2014 2014 Term Loan [Member] Fair Value [Member] | Sep. 30, 2014 2014 Term Loan [Member] Principal Balance [Member] | Sep. 30, 2014 2014 Term Loan [Member] Carrying Value [Member] | Dec. 31, 2013 BNDES Loans [Member] Fair Value [Member] | Dec. 31, 2013 BNDES Loans [Member] Principal Balance [Member] | Dec. 31, 2013 BNDES Loans [Member] Carrying Value [Member]
Fair Value Inputs Assets Liabilities Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, Fair Value | $ 8,502,393 | $ 6,923,448 | $ 7,559,568 | $ 5,910,041 | $ 7,550,088 | $ 5,876,607 |  |  |  | $ 1,325,115 | $ 1,479,859 | $ 367,068 | $ 499,944 | $ 367,068 | $ 468,394 |  |  | $ 262,031 | $ 243,750 | $ 242,387 |  |  | $ 507,500 | $ 514,375 | $ 500,000 | $ 500,000 | $ 500,000 | $ 500,000 |  |  | $ 814,000 | $ 832,000 | $ 800,000 | $ 800,000 | $ 800,000 | $ 800,000 |  |  |  | $ 729,375 | $ 750,000 | $ 743,992 |  |  | $ 680,503 | $ 689,717 | $ 680,000 | $ 680,000 | $ 680,000 | $ 680,000 |  |  | $ 573,392 | $ 586,586 | $ 550,000 | $ 550,000 | $ 550,000 | $ 550,000 |  |  | $ 616,747 | $ 604,736 | $ 610,000 | $ 610,000 | $ 610,000 | $ 610,000 |  |  | $ 419,598 | $ 408,442 | $ 425,000 | $ 425,000 | $ 425,000 | $ 425,000 |  |  | $ 570,751 | $ 530,098 | $ 575,000 | $ 575,000 | $ 575,000 | $ 575,000 |  |  | $ 330,759 | $ 318,856 | $ 330,000 | $ 330,000 | $ 330,000 | $ 330,000 |  | $ 300,000 | $ 215,000 | $ 300,000 | $ 215,000 | $ 300,000 | $ 215,000 |  | $ 180,980 | $ 180,529 | $ 180,234 |  | $ 175,809 | $ 184,538 | $ 176,250 | $ 185,000 | $ 176,250 | $ 185,000 |  | $ 110,383 | $ 109,971 | $ 109,745 |  |  | $ 1,458,844 | $ 1,496,250 | $ 1,492,778 | $ 5,847 | $ 5,847 | $ 5,847
Debt instrument stated percentage |  |  |  |  |  |  | 1.875% | 4.00% | 4.00% |  |  |  |  |  |  | 8.25% | 8.25% |  |  |  | 5.625% | 5.625% |  |  |  |  |  |  | 5.75% | 5.75% |  |  |  |  |  |  |  | 4.875% | 4.875% |  |  |  | 4.254% | 4.254% |  |  |  |  |  |  | 5.101% | 5.101% |  |  |  |  |  |  | 2.933% | 2.933% |  |  |  |  |  |  | 2.24% | 2.24% |  |  |  |  |  |  | 3.722% | 3.722% |  |  |  |  |  |  | 3.598% | 3.598% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Maturity Date |  |  |  |  |  |  |  | Oct. 01, 2014 | Oct. 01, 2014 |  |  |  |  |  |  | Aug. 15, 2019 | Aug. 15, 2019 |  |  |  | Oct. 01, 2019 | Oct. 01, 2019 |  |  |  |  |  |  | Jul. 15, 2020 | Jul. 15, 2020 |  |  |  |  |  |  | Jul. 15, 2022 | Jul. 15, 2022 |  |  |  |  | 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 |  |  |  |  |  |  | May 09, 2017 |  |  |  |  |  |  | Jun. 30, 2018 |  |  |  | May 09, 2017 |  |  |  |  |  |  | Sep. 28, 2019 |  |  |  | Mar. 24, 2021 | Mar. 24, 2021 |  |  |  |  |  |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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