Investments (Schedule Of Fair Value Method Investments, Balance Sheets And Income Statements) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Cost of goods sold	$ 183,754	$ 192,084	$ 373,185	$ 382,778
Cash and cash equivalents	47,405	44,008	47,405	44,008	$ 50,056	$ 52,617
Property & equipment	250,459		250,459		269,957
Other long-term assets	47,283		47,283		47,798
Total assets	757,989		757,989		788,626
Long term debt, net (b)	135,000		135,000		137,250
Equity	355,855		355,855		372,029
Total liabilities and shareholders’ equity	757,989		757,989		788,626
Income tax benefit (expense)	(903)	(2,164)	(5,682)	(6,772)
Net income	594	3,752	10,464	12,231
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Revenues	10,068	4,410	14,918	6,968
Cost of goods sold	2,807	0	5,137	0
Cash and cash equivalents	101,407		101,407		117,589
Restricted Cash	8,289		8,289		14,498
Other current assets	21,609		21,609		17,916
Property & equipment	9,526		9,526		10,824
Patents	2,749		2,749		2,702
Other long-term assets	669		669		15
Total assets	144,249		144,249		163,544
Other current liabilities	6,792		6,792		8,123
Other noncurrent liabilities	1,182		1,182		1,247
Long term debt, net (b)	146,984		146,984		146,629
Redeemable preferred stock	23,430		23,430		22,946
Equity	(34,139)		(34,139)		(15,401)
Total liabilities and shareholders’ equity	144,249		144,249		$ 163,544
Expenses and other, net (a)	14,006	14,658	28,390	22,974
Income tax benefit (expense)	0	3,892	(4)	6,131
Net income	$ (6,745)	$ (6,356)	$ (18,613)	$ (9,875)