Notes Payable, Long-Term Debt and Other Obligations (Convertible Notes Table) (Details) - Convertible Debt [Member] - USD ($)		3 Months Ended	12 Months Ended
	Feb. 03, 2015	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Conversion basis amount		$ 1,000
6.75% Variable Interest Senior Convertible Note due 2014 - Vector
Debt Instrument [Line Items]
Note conversion (in shares)	2,338,930
Variable Interest 7.50% Senior Convertible Debentures [Member]
Debt Instrument [Line Items]
Conversion price		$ 15.98	$ 15.98
Note conversion (in shares)		62.5743	62.5743
5.5% Variable Interest Senior Convertible Notes due 2020
Debt Instrument [Line Items]
Conversion price		$ 24.64	$ 24.64
Note conversion (in shares)		40.5891	40.5891