Financial Commitments (Summary Of Interest Expense As Reported In The Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other interest	$ 862	$ 1,336
Total cash interest expense	11,728	12,393
Total non-cash interest expense	3,836	1,687
Total cash and non-cash interest expense	15,564	14,080
2010 Senior Notes [Member]
Interest on debt	5,719	5,719
Total non-cash interest expense	$ 254	248
Effective interest rates	7.99%
Convertible Notes [Member]
Interest on debt	$ 1,438
Total non-cash interest expense	$ 2,164
Effective interest rates	9.39%
2014 Credit Facility [Member]
Interest on debt	$ 3,709	5,338
Total non-cash interest expense	$ 1,418	$ 1,439
Effective interest rates	9.86%