Investments (Schedule Of Fair Value Method Investments, Balance Sheets And Income Statements) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 45,227	$ 37,685	$ 52,617	$ 48,822
Property & equipment	287,421		282,560
Other long-term assets	49,266		49,641
Total assets	808,530		793,008
Long term debt, net of discount	134,000		139,000
Equity	416,170		402,664
Total liabilities and shareholders’ equity	808,530		793,008
Expenses and other, net	(222,032)	(229,069)
Income tax benefit (expense)	(4,608)	(3,764)
Net income	8,479	4,277
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Cash and cash equivalents	28,070		33,560
Other current assets	7,570		5,682
Property & equipment	11,110		10,559
Patents	2,487		2,433
Other long-term assets	777		445
Total assets	50,014		52,679
Long-term debt, net of discount, current portion	14,852		5,414
Other current liabilities	5,856		4,845
Non-current liabilities	2,698		3,098
Long term debt, net of discount	0		9,372
Redeemable preferred stock	22,211		21,970
Equity	4,397		7,980
Total liabilities and shareholders’ equity	50,014		52,679
Royalty revenues	2,558	1,800
Expenses and other, net	(8,316)	(3,802)
Income tax benefit (expense)	2,239	1,087
Net income	$ (3,519)	$ (915)