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Debt (Senior Convertible Notes) (Narrative) (Details) (USD $) | 12 Months Ended |  | 3 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended |  | 3 Months Ended | 12 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] 2011 Senior Convertible Notes [Member] | Dec. 31, 2012 Convertible Debt [Member] Unsecured Debt [Member] 2011 Senior Convertible Notes [Member] | Dec. 31, 2011 Convertible Debt [Member] Unsecured Debt [Member] 2011 Senior Convertible Notes [Member] | Mar. 31, 2011 Convertible Debt [Member] Unsecured Debt [Member] 2011 Senior Convertible Notes [Member] | Mar. 31, 2011 Convertible Debt [Member] Unsecured Debt [Member] 2011 Senior Convertible Notes [Member] Aggregate Principal [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] 2011 Senior Convertible Notes [Member] Convertible Term 1 [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] 2011 Senior Convertible Notes [Member] Convertible Term 2 [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] 2011 Senior Convertible Notes [Member] Convertible Term 3 [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] 2011 Senior Convertible Notes [Member] Weighted Average [Member] | Mar. 31, 2011 Convertible Debt [Member] Unsecured Debt [Member] 2009 4.25% Notes [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] 2009 4.25% Notes [Member] | Dec. 31, 2009 Convertible Debt [Member] Unsecured Debt [Member] 2009 4.25% Notes [Member] | Nov. 30, 2009 Convertible Debt [Member] Unsecured Debt [Member] 2009 4.25% Notes [Member] | Mar. 31, 2011 Convertible Debt [Member] Unsecured Debt [Member] 2009 4.0% Notes [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] 2009 4.0% Notes [Member] | Dec. 31, 2009 Convertible Debt [Member] Unsecured Debt [Member] 2009 4.0% Notes [Member] | Jun. 30, 2009 Convertible Debt [Member] Unsecured Debt [Member] 2009 4.0% Notes [Member] | Mar. 31, 2011 Convertible Debt [Member] Unsecured Debt [Member] 2011 4.0% Notes [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] 2011 4.0% Notes [Member] | Mar. 31, 2011 Convertible Debt [Member] Unsecured Debt [Member] 2011 4.25% Notes [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] 2011 4.25% Notes [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] Total Convertible Debt [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] Total Convertible Debt [Member] Scenario, Plan [Member] | Dec. 31, 2013 Convertible Debt [Member] Unsecured Debt [Member] Total Convertible Debt [Member] Scenario, Plan [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument exchange fee description |  | During the first quarter of 2011, the Company exchanged $105.3 million of its 4.0% senior convertible notes issued in 2009 (the "2009 4.0% Notes") and $97.0 million of its 4.25% senior convertible notes issued in 2009 (the "2009 4.25% Notes") for identical principal amounts of 2011 4.0% Notes and 2011 4.25% Notes, respectively, for an exchange fee of approximately 50 basis points, or 0.5%, of the aggregate principal amount of the notes exchanged. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, exchanged amount |  | $ 0 | $ 0 | $ 202,322,000 |  |  |  |  |  |  | $ 97,000,000 |  |  |  | $ 105,300,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  | 4.25% |  |  |  | 4.00% |  |  |  | 4.00% |  | 4.25% |  |  |
Debt instrument, exchanged amount, new instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,300,000 |  | 97,000,000 |  |  |  |
Debt instrument, basis spread, variable interest or fee |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, terms of conversion feature |  |  |  |  |  |  | if the last reported sale price of the Company’s common stock is greater than or equal to 130% of the applicable conversion price of the 2011 Convertible Notes during at least 20 of the last 30 consecutive trading days ending on and including the last trading day of a calendar quarter, then the applicable 2011 Convertible Notes may be converted during the immediately following calendar quarter (and only during such calendar quarter); | if after any five consecutive trading-day period in which the trading price per $1,000 principal amount of 2011 Convertible Notes for each trading day during such period was less than 98% of the product of the last reported sale price of the Company’s common stock and the applicable conversion rate, then the applicable 2011 Convertible Notes may be converted during the immediately following five business day period; | if the Company effects certain distributions to its shareholders or if the Company is party to a consolidation, merger, binding share exchange, or a sale, transfer, lease or other conveyance of all or substantially all of its assets, pursuant to which the Company’s common stock would be converted into or exchanged for, or would constitute solely the right to receive cash, securities or other assets, or in the case of certain other fundamental changes, then the 2011 Convertible Notes may be converted during the period that is 45 trading days prior to the ex-dividend date or the initial anticipated effective date of the transaction, as applicable. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 6.73% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt discount and financing costs |  | 4,000,000 | 9,300,000 |  | 17,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, remaining discount amortization period |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, issuance date |  |  |  |  |  |  |  |  |  |  |  | Nov. 30, 2009 |  |  |  | Jun. 30, 2009 |  |  |  |  |  |  |  |  |
Debt instrument, principal amount |  | 202,300,000 |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  | 115,000,000 |  | 105,300,000 |  | 97,000,000 | 215,000,000 |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  |  |  |  | Dec. 15, 2014 |  |  |  | Jun. 15, 2014 |  |  |  | Jun. 15, 2014 |  | Dec. 15, 2014 |  |  |
Debt instrument, payment terms |  |  |  |  |  |  |  |  |  |  |  | The 2009 4.25% Notes bear interest at a rate of 4.25% per year, payable semi-annually in arrears, on June 15 and December 15 of each year. |  |  |  | The 2009 4.0% Notes bear interest at a rate of 4.0% per year, payable semi-annually in arrears, on June 15 and December 15 of each year. |  |  |  |  |  |  |  |  |
Debt instrument, convertible, latest date |  |  |  |  |  |  |  |  |  |  |  | Dec. 12, 2014 |  |  |  | Jun. 13, 2014 |  |  |  |  |  |  |  |  |
Debt instrument, convertible, conversion ratio |  |  |  |  |  |  |  |  |  |  |  | 64.6162 |  |  |  | 63.4417 |  |  |  |  |  |  |  |  |
Debt instrument, conversion price per share |  |  |  |  |  |  |  |  |  |  |  | $ 15.48 |  |  |  | $ 15.76 |  |  |  | $ 15.76 |  | $ 15.48 |  |  |
Debt issuance cost | 9,600,000 |  |  |  |  |  |  |  |  |  |  |  | 3,700,000 |  |  |  | 5,400,000 |  |  |  |  |  |  |  |
Convertible notes, guarantees |  | The 4.25% and 4.0% senior convertible notes are guaranteed by certain of the Company's 100%-owned direct and indirect domestic operating subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, restrictive covenants |  | There are no financial covenants associated with these notes; however, there are certain nonfinancial provisions and covenants. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt, intent to refinance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | The Company expects to refinance the $215.0 million principal amount of the senior convertible notes on a long-term basis either through its 2013 Credit Facility or through other sources of available funding and, therefore, has included the carrying amounts of these notes as a component of long-term debt as of December 31, 2013.
Short-term debt, refinanced, amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 215,000,000 |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1927-112601 + Details
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- Definition Description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet. The description generally includes a general discussion of the terminated financing agreement and the terms of the new obligation or equity securities issued or expected to be issued as a result of the refinancing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1927-112601 + Details
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