Fair Value Measurements (Summary Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Total included in cash and cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 75,000	$ 0
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	75,000	0
Total included in restricted cash and cash equivalents
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,888	26,210
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	21,888	26,210
Long-term available-for-sale securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,766	1,766
Gross Unrealized Gains	728	501
Gross Unrealized (Losses)	0	0
Fair Value	2,494	2,267
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	96,888	26,210
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	96,888	26,210
Equity securities \| Long-term available-for-sale securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,766	1,766
Gross Unrealized Gains	728	501
Gross Unrealized (Losses)	0	0
Fair Value	$ 2,494	$ 2,267

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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