Notes Payable, Long-Term Debt and Other Obligations (Convertible Notes Table) (Details) - Convertible Debt	6 Months Ended
	Jun. 30, 2017 $ / shares	Jun. 30, 2016	Dec. 31, 2016 $ / shares
7.5% Variable Interest Senior Convertible Notes due 2019
Debt Instrument [Line Items]
Conversion Price (in dollars per share)	$ 15.22		$ 15.22
Conversion ratio	0.065703	0.065703
5.5% Variable Interest Senior Convertible Debentures due 2020
Debt Instrument [Line Items]
Conversion Price (in dollars per share)	$ 23.46		$ 23.46
Conversion ratio	0.0426185	0.0426185