Investments (Schedule Of Fair Value Method Investments, Balance Sheets And Income Statements) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Cost of goods sold	$ 163,053	$ 189,431
Cash and cash equivalents	40,022	55,155	$ 44,156	$ 50,056
Property & equipment	240,140		231,315
Other long-term assets	30,801		27,869
Total assets	635,763		623,260
Long term debt, net (a)	107,000		104,000
Equity	291,469		272,748
Total liabilities and shareholders’ equity	635,763		623,260
Income tax benefit (expense)	3,216	4,779
Net income	7,281	9,870
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Revenues	(3,050)	4,850
Cost of goods sold	3,622	2,330
Cash and cash equivalents	96,431		91,844
Restricted Cash	3,748		8,182
Other current assets	19,063		9,070
Property & equipment	15,821		8,453
Patents	2,867		2,811
Other long-term assets	114		92
Total assets	138,044		120,452
Other current liabilities	33,644		10,261
Other noncurrent liabilities	609		552
Long term debt, net (a)	142,868		142,696
Redeemable preferred stock	0		0
Equity	(39,077)		(33,057)
Total liabilities and shareholders’ equity	138,044		$ 120,452
Expenses and other, net (a)	(541)	14,384
Income tax benefit (expense)	8	4
Net income	$ (6,139)	$ (11,868)