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Fair Value Measurements (Narrative) (Details) (USD $) | 9 Months Ended | 0 Months Ended |  |  | 9 Months Ended | 1 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Apr. 30, 2014 ARS [Member] | Mar. 31, 2014 ARS [Member] | Dec. 31, 2013 ARS [Member] | Sep. 30, 2014 Term Loan [Member] | Jan. 31, 2012 Term Loan [Member] Swap [Member] | Sep. 30, 2014 Term Loan [Member] Swap [Member] | Sep. 30, 2014 Fair value [Member] Senior unsecured notes [Member] | Dec. 31, 2013 Fair value [Member] Senior unsecured notes [Member] | Sep. 30, 2014 Carrying value [Member] Senior unsecured notes [Member] | Dec. 31, 2013 Carrying value [Member] Senior unsecured notes [Member] | Sep. 30, 2014 Carrying value [Member] Other long-term debt [Member] | Dec. 31, 2013 Carrying value [Member] Other long-term debt [Member]
Long-term Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  | $ 312,200,000 | $ 321,000,000 | $ 298,700,000 | $ 298,500,000 | $ 646,800,000 | $ 435,400,000
Face amount |  |  |  |  | 250,000,000 | 200,000,000 |  |  |  |  |  |  |
Term of debt |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Maturity date |  |  |  |  | Jun. 05, 2019 |  |  |  |  |  |  |  |
Debt Instrument, Issuance Date |  |  |  |  | Jun. 05, 2014 |  | Jun. 05, 2014 |  |  |  |  |  |
Investments |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in auction rate securities |  |  | 46,300,000 | 46,300,000 |  |  |  |  |  |  |  |  |
Proceeds from Sale of Available-for-sale Securities, Debt | 44,497,000 | 44,500,000 |  |  |  |  |  |  |  |  |  |  |
Loss on sale of investments | $ 1,786,000 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26805-111562 + Details
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- Definition Date the debt instrument was issued, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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