Financial Commitments (Summary Of Interest Expense As Reported In The Condensed Consolidated Statements of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other interest	$ 863	$ 1,393	$ 2,199	$ 2,959
Total cash interest expense	13,873	10,745	26,266	21,626
Total non-cash interest expense	1,661	523	3,348	1,045
Total cash and non-cash interest expense	15,534	11,268	29,614	22,671
Senior Notes [Member]
Interest on debt	5,719	5,719	11,438	11,438
Total non-cash interest expense	$ 250	244	$ 498	487
Effective interest rates	7.99%		7.99%
Convertible Notes [Member]
Interest on debt	$ 240		$ 240
Total non-cash interest expense	$ 340		$ 340
Effective interest rates	9.37%		9.37%
Credit Facility [Member]
Interest on debt	$ 7,051	3,633	$ 12,389	7,229
Total non-cash interest expense	$ 1,071	$ 279	$ 2,510	$ 558
Effective interest rates	9.66%		9.66%