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Financial Instruments (Narrative) (Details) (USD $) |  | 9 Months Ended | 0 Months Ended | 9 Months Ended |  | 9 Months Ended | 0 Months Ended | 9 Months Ended |  |  | 0 Months Ended | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2013 Private Placement, Notes [Member] | Sep. 23, 2013 Credit Agreement [Member] | Sep. 30, 2013 Credit Agreement [Member] | Dec. 31, 2010 Credit Agreement [Member] | Sep. 30, 2013 Credit Agreement [Member] Minimum [Member] | Sep. 30, 2013 Credit Agreement [Member] Maximum [Member] | Jul. 16, 2013 Credit Agreement [Member] Interest Rate Swap [Member] | Sep. 30, 2013 Credit Agreement [Member] Interest Rate Swap [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] | Sep. 30, 2013 Convertible Notes [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 167,700,000 |  |  |  |  |  |  |  |  |  |  |
Amount of credit facility |  |  |  | 330,000,000 | 390,000,000 |  |  |  |  |  |  |  |
Amount of credit facility outstanding |  |  |  | 152,000,000 |  |  |  |  |  |  |  |  |
Additional amount that can be borrowed on facility |  |  |  | 178,000,000 |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | 105,000,000 | 110,000,000 | 105,000,000 |  |
Fixed interest rate in swap |  |  |  |  |  |  |  |  |  | 1.414% | 2.04% |  |
LIBOR spread |  |  | 1.375% |  |  | 1.25% | 1.875% | 0.27% | 0.18% |  |  |  |
Effective annual rate |  |  |  |  |  |  |  |  | 3.415% |  |  |  |
Maximum leverage ratio allowed | 3.50 |  |  |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio required | 3.00 |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio | 1.77 |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio | 8.30 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of principal redeemed |  |  |  |  |  |  |  |  |  |  |  | 100.00% |
Cash paid to redeem convertible senior notes |  |  |  |  |  |  |  |  |  |  |  | 28,400,000 |
Strike price of warrants |  |  |  |  |  |  |  |  |  |  |  |  | 52.25
Final expiration date |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 10, 2013
Notes hedge and warrant transactions, net cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,700,000

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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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