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Financial Instruments (Narrative) (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified |  |  | 9 Months Ended |  | 9 Months Ended |  |  |  |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 Private Placement, Notes [Member] | Dec. 31, 2011 Private Placement, Notes [Member] | Sep. 30, 2012 Credit Agreement [Member] | Dec. 31, 2011 Credit Agreement [Member] | Jul. 16, 2012 Credit Agreement [Member] Interest Rate Swap [Member] | Jul. 16, 2010 Credit Agreement [Member] Interest Rate Swap [Member] | Dec. 31, 2006 Previous Line Of Credit [Member] | Sep. 30, 2012 Convertible Notes [Member] | Dec. 31, 2011 Convertible Notes [Member] | Mar. 31, 2006 Convertible Notes [Member] | Sep. 30, 2012 Warrants [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of debt | $ 322,195,000 | $ 374,388,000 | $ 150,000,000 | $ 150,000,000 | $ 134,000,000 | $ 187,000,000 |  |  |  | $ 28,052,000 | $ 27,228,000 |  |
Debt issued |  |  |  |  |  |  |  |  |  | 28,437,000 |  | 180,000,000 |
Interest rate |  |  | 6.84% |  |  |  |  |  |  | 2.25% |  |  |
Maturity date |  |  | Oct. 25, 2017 |  |  |  |  |  |  |  |  |  |
Year of maturity |  |  |  |  | 2015 |  |  |  |  | 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 |  |  | 174,600,000 |  |  |  |  |  |  | 28,300,000 |  |  |
Amount of credit facility |  |  |  |  | 390,000,000 |  |  |  | 460,000,000 |  |  |  |
Amount of credit facility outstanding |  |  |  |  | 134,000,000 |  |  |  |  |  |  |  |
Additional amount that can be borrowed on facility |  |  |  |  | 256,000,000 |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | 105,000,000 |  |  |  |  |
Fixed interest rate in swap |  |  |  |  |  |  | 0.46% | 2.04% |  |  |  |  |
LIBOR spread |  |  |  |  |  |  | 2.25% |  |  |  |  |  |
Effective annual rate |  |  |  |  |  |  | 4.29% |  |  |  |  |  |
Maximum leverage ratio allowed | 3.5 |  |  |  |  |  |  |  |  |  |  |  |
Minimum interest coverage ratio required | 3 |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio | 1.06 |  |  |  |  |  |  |  |  |  |  |  |
Interest coverage ratio | 13.56 |  |  |  |  |  |  |  |  |  |  |  |
Date when holders may convert |  |  |  |  |  |  |  |  |  | Feb. 15, 2013 |  |  |
Shares per $1,000 of principal |  |  |  |  |  |  |  |  |  | 23.2078 |  |  |
Minimum per share distribution value allowing conversion |  |  |  |  |  |  |  |  |  | 15.00% |  |  |
Percent of product which allows conversion |  |  |  |  |  |  |  |  |  | 103.00% |  |  |
Conversion price |  |  |  |  |  |  |  |  |  | $ 43.09 |  |  |
Earliest redemption date |  |  |  |  |  |  |  |  |  | Mar. 15, 2013 |  |  |
Redemption price, percent of principal |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Covenant, voting power |  |  |  |  |  |  |  |  |  | 50.00% |  |  |
Note hedge and warrant, net cost |  |  |  |  |  |  |  |  |  | 14,700,000 |  |  |
Number of warrants sold |  |  |  |  |  |  |  |  |  | 4.1 |  |  |
Strike price of warrants |  |  |  |  |  |  |  |  |  | 52.25 |  |  |
Date warrants can be exercised |  |  |  |  |  |  |  |  |  | Sep. 15, 2013 |  |  |
Carrying amount of equity component |  |  |  |  |  |  |  |  |  | $ 25,500,000 |  |  |
Incremental net shares will be included in future diluted earnings per share, maximum average common stock price |  |  |  |  |  |  |  |  |  |  |  |  | $ 49.2

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- Definition Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any. + References Reference 1: 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 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 SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant