Debt (Schedule Of Cash And Non-Cash Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended								12 Months Ended				12 Months Ended				12 Months Ended				12 Months Ended			12 Months Ended			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 1.875% Convertible Senior Notes [Member]	Dec. 31, 2012 1.875% Convertible Senior Notes [Member]	Dec. 31, 2011 1.875% Convertible Senior Notes [Member]	Apr. 18, 2013 1.875% Convertible Senior Notes [Member]	May 16, 2008 1.875% Convertible Senior Notes [Member]	Dec. 31, 2013 4.0% Convertible Senior Notes [Member]	Dec. 31, 2012 4.0% Convertible Senior Notes [Member]	Dec. 31, 2011 4.0% Convertible Senior Notes [Member]	Apr. 29, 2009 4.0% Convertible Senior Notes [Member]	Dec. 31, 2012 8.0% Senior Notes [Member]	Dec. 31, 2011 8.0% Senior Notes [Member]	Dec. 31, 2013 8.0% Senior Notes [Member]	Jul. 24, 2009 8.0% Senior Notes [Member]	Dec. 31, 2013 8.25% Senior Notes [Member]	Dec. 31, 2012 8.25% Senior Notes [Member]	Dec. 31, 2011 8.25% Senior Notes [Member]	Jul. 24, 2009 8.25% Senior Notes [Member]	Dec. 31, 2013 5.625% Senior Notes [Member]	Dec. 31, 2012 5.625% Senior Notes [Member]	Sep. 28, 2012 5.625% Senior Notes [Member]	Dec. 31, 2013 5.75% Senior Notes [Member]	Dec. 31, 2012 5.75% Senior Notes [Member]	Jul. 13, 2012 5.75% Senior Notes [Member]	Dec. 31, 2013 2010 Secured Tower Revenue Securities [Member]	Dec. 31, 2012 2010 Secured Tower Revenue Securities [Member]	Dec. 31, 2011 2010 Secured Tower Revenue Securities [Member]	Dec. 31, 2013 2012 Secured Tower Revenue Securities [Member]	Dec. 31, 2012 2012 Secured Tower Revenue Securities [Member]	Dec. 31, 2013 2013 Secured Tower Revenue Securities [Member]	Dec. 31, 2013 Revolving Credit Facility [Member]	Dec. 31, 2012 Revolving Credit Facility [Member]	Dec. 31, 2011 Revolving Credit Facility [Member]	Dec. 31, 2013 2011 Term Loan [Member]	Dec. 31, 2012 2011 Term Loan [Member]	Dec. 31, 2011 2011 Term Loan [Member]	Dec. 31, 2013 2012-1 Term Loan A [Member]	Dec. 31, 2012 2012-1 Term Loan A [Member]	Dec. 31, 2013 2012-2 Term Loan [Member]	Dec. 31, 2012 2012-2 Term Loan [Member]	Dec. 31, 2012 Mobilitie Bridge Loan [Member]	Dec. 31, 2013 Other [Member]	Dec. 31, 2012 Other [Member]	Dec. 31, 2011 Other [Member]
Debt Instrument [Line Items]
Cash Interest	$ 249,051	$ 196,241	$ 160,896	$ 2,670	$ 9,885	$ 10,090			$ 19,998	$ 20,000	$ 20,000		$ 15,867	$ 30,000			$ 20,109	$ 23,177	$ 30,938		$ 28,125	$ 7,266		$ 46,000	$ 21,594		$ 57,383	$ 57,377	$ 57,371	$ 18,085	$ 7,133	$ 30,392	$ 4,515	$ 4,392	$ 3,209	$ 10,533	$ 18,894	$ 9,705	$ 4,557	$ 3,567	$ 6,416	$ 2,969	$ 4,239	$ 268	$ (119)	$ (417)
Non-cash Interest	$ 49,085	$ 70,110	$ 63,629	$ 10,434	$ 36,388	$ 33,844			$ 38,307	$ 33,149	$ 29,149		$ 174	$ 309			$ 182	$ 192	$ 237																	$ 101	$ 179	$ 90			$ 61	$ 28
Debt instrument, interest rate, stated percentage				1.875%			1.875%	1.875%	4.00%			4.00%			8.00%	8.00%	8.25%			8.25%	5.625%		5.625%	5.75%		5.75%