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Financial Instruments (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |  | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Private Placement, Notes [Member] | Dec. 23, 2013 Credit Agreement [Member] | Dec. 31, 2013 Credit Agreement [Member] | Oct. 16, 2013 Credit Agreement [Member] | Dec. 31, 2010 Credit Agreement [Member] | Dec. 31, 2013 Credit Agreement [Member] Minimum [Member] | Dec. 31, 2013 Credit Agreement [Member] Maximum [Member] | May 20, 2013 Credit Agreement [Member] Interest Rate Swap [Member] | Jul. 16, 2010 Credit Agreement [Member] Interest Rate Swap [Member] | Mar. 15, 2013 Convertible Notes [Member] | Dec. 31, 2013 Convertible Notes [Member] | Dec. 31, 2012 Convertible Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments due in 2014 | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments due in 2015 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments due in 2017 | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments due in 2018 | 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal payments due 2019 and thereafter | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest paid | 16,100,000 | 18,400,000 | 20,200,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  | 28,437,000
Interest rate |  |  |  | 6.84% |  |  |  |  |  |  |  |  |  | 2.25% |
Maturity date |  |  |  | Oct. 25, 2017 |  |  |  |  |  |  |  |  |  |  |
Year of maturity |  |  |  |  |  | 2018 |  |  |  |  |  |  |  | 2026 |
Payment required on October 25, 2013 |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Payment required on October 25, 2015 |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value of long-term debt |  |  |  | 114,500,000 |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  |  |  | 330,000,000 |  | 390,000,000 |  |  |  |  |  |  |
Amount of credit facility outstanding |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |  |  |
Additional amount that can be borrowed on facility |  |  |  |  |  | 130,000,000 |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  | 110,000,000 | 105,000,000 |  |  |
Fixed interest rate in swap |  |  |  |  |  |  |  |  |  |  | 1.414% | 2.04% |  |  |
LIBOR spread |  |  |  |  | 1.375% |  |  |  | 1.25% | 1.875% |  |  |  |  |
Effective annual rate |  |  |  |  |  | 3.415% |  |  |  |  |  |  |  |  |
LIBOR rate |  |  |  |  |  | 0.17% | 0.25% |  |  |  |  |  |  |  |
Maximum leverage ratio allowed | 3.50 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio required | 3.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio | 1.78 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio | 8.85 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal redeemed |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |
Cash paid to redeem convertible senior notes |  |  |  |  |  |  |  |  |  |  |  |  | 28,400,000 |  |
Note hedge and warrant, net cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,700,000 |
Strike price of warrants |  |  |  |  |  |  |  |  |  |  |  |  |  | 52.25 |

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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- Definition The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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