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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Long-term Debt |  |
Transfers between Levels 1 and 2, description | The Company did not have material transfers between Levels 1 and 2 during the nine months ended September 30, 2017 or 2016. |
Restricted investments, amortized cost | $ 48,775 |
Long-term debt, carrying amount | 886,276 | $ 759,519
2017 Senior Notes [Member] |  |
Long-term Debt |  |
Long-term debt, fair value | 537,500 |
Long-term debt, carrying amount | 492,545 |
2010 Senior Notes [Member] |  |
Long-term Debt |  |
Long-term debt, fair value |  | 302,600
Long-term debt, carrying amount |  | 298,120
Convertible Notes [Member] |  |
Long-term Debt |  |
Long-term debt, fair value | 231,900 | 228,400
Long-term debt, carrying amount | 159,314 | $ 152,668
Significant Other Observable Inputs (Level 2) [Member] |  |
Long-term Debt |  |
Restricted investments, fair value | $ 48,700 |

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- Definition Description of the transfers of assets measured on a recurring basis out of Level 1 and into Level 2 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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