Debt (Schedule Of Cash And Non-Cash Interest Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Sep. 28, 2012	Jul. 13, 2012	Jul. 01, 2014
Debt Instrument [Line Items]
Cash Interest	$ 77,654	$ 66,027
Non-cash Interest	280	10,304
4.0% Convertible Senior Notes [Member]
Debt Instrument [Line Items]
Cash Interest		4,998
Non-cash Interest		10,202
Debt instrument, interest rate, stated percentage	4.00%
8.25% Senior Notes [Member]
Debt Instrument [Line Items]
Cash Interest		5,027
Non-cash Interest		48
Debt instrument, interest rate, stated percentage	8.25%
5.625% Senior Notes [Member]
Debt Instrument [Line Items]
Cash Interest	7,031	7,031
Debt instrument, interest rate, stated percentage	5.625%		5.625%
5.75% Senior Notes [Member]
Debt Instrument [Line Items]
Cash Interest	11,500	11,500
Debt instrument, interest rate, stated percentage	5.75%			5.75%
4.875% Senior Notes [Member]
Debt Instrument [Line Items]
Cash Interest	9,141
Non-cash Interest	161
Debt instrument, interest rate, stated percentage	4.875%				4.875%
2010 Tower Securities [Member]
Debt Instrument [Line Items]
Cash Interest	7,058	14,345
2012 Tower Securities [Member]
Debt Instrument [Line Items]
Cash Interest	4,531	4,521
2013 Tower Securities [Member]
Debt Instrument [Line Items]
Cash Interest	10,804	10,804
2014 Tower Securities [Member]
Debt Instrument [Line Items]
Cash Interest	12,785
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Cash Interest	1,571	1,332
2011 Term Loan [Member]
Debt Instrument [Line Items]
Cash Interest		696
Non-cash Interest		7
2012-1 Term Loan [Member]
Debt Instrument [Line Items]
Cash Interest	1,153	1,000
2012-2 Term Loan [Member]
Debt Instrument [Line Items]
Cash Interest		424
Non-cash Interest		4
2014 Term Loan [Member]
Debt Instrument [Line Items]
Cash Interest	12,125	4,130
Non-cash Interest	119	43
Other [Member]
Debt Instrument [Line Items]
Cash Interest	$ (45)	$ 219