Financial Commitments (Summary Of Interest Expense As Reported In The Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Other interest	$ 556	$ 1,456	$ 2,755	$ 4,417
Total cash interest expense	11,266	10,690	37,531	32,316
Total non-cash interest expense	3,775	524	7,124	1,569
Total cash and non-cash interest expense	15,041	11,214	44,655	33,885
2010 Senior Notes [Member]
Interest on debt	5,719	5,719	17,156	17,156
Total non-cash interest expense	$ 251	245	$ 750	732
Effective interest rates	7.99%		7.99%
Convertible Notes [Member]
Interest on debt	$ 1,438		$ 1,677
Total non-cash interest expense	$ 2,066		$ 2,405
Effective interest rates	9.39%		9.39%
Credit Facility [Member]
Interest on debt	$ 3,553	3,515	$ 15,943	10,743
Total non-cash interest expense	$ 1,458	$ 279	$ 3,969	$ 837
Effective interest rates	9.86%		9.86%