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
	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