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Long-Term Debt (Details) |  |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended |  |  | 9 Months Ended |  |  | 3 Months Ended |  | 0 Months Ended | 1 Months Ended |  |  | 1 Months Ended |  | 1 Months Ended | 3 Months Ended |  |  |  |  |
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Sep. 30, 2012 USD ($) | Dec. 31, 2011 USD ($) | Sep. 30, 2012 US Credit Agreement Revolving Credit Line USD ($) | Sep. 30, 2012 US Credit Agreement Revolving Credit Line USD ($) | Dec. 31, 2011 US Credit Agreement Revolving Credit Line USD ($) | Sep. 30, 2012 US Credit Agreement Term Loan USD ($) | Dec. 31, 2011 US Credit Agreement Term Loan USD ($) | Sep. 30, 2012 US Credit Agreement Letters of Credit USD ($) | Sep. 30, 2012 UK Credit Agreement Revolving Credit Line USD ($) | Sep. 30, 2012 UK Credit Agreement Revolving Credit Line GBP (£) | Dec. 31, 2011 UK Credit Agreement Revolving Credit Line USD ($) | Sep. 30, 2012 UK Credit Agreement Revolving Credit Line Minimum | Sep. 30, 2012 UK Credit Agreement Revolving Credit Line Maximum | Sep. 30, 2012 U.K. acquisition term loan GBP (£) | Sep. 30, 2012 U.K. acquisition term loan USD ($) | Jan. 31, 2012 U.K. acquisition term loan GBP (£) | Sep. 30, 2012 U.K. acquisition term loan Minimum | Sep. 30, 2012 U.K. acquisition term loan Maximum | Sep. 30, 2012 UK Credit Agreement Overdraft Line of Credit USD ($) | Sep. 30, 2012 UK Credit Agreement Overdraft Line of Credit GBP (£) | Dec. 31, 2011 UK Credit Agreement Overdraft Line of Credit USD ($) | Jun. 25, 2012 3.5% senior subordinated convertible notes due 2026 USD ($) | Jun. 21, 2012 3.5% senior subordinated convertible notes due 2026 USD ($) item | Jul. 31, 2012 3.5% senior subordinated convertible notes due 2026 USD ($) | May 31, 2012 3.5% senior subordinated convertible notes due 2026 | Sep. 30, 2012 3.5% senior subordinated convertible notes due 2026 | Dec. 31, 2011 3.5% senior subordinated convertible notes due 2026 USD ($) | Aug. 31, 2012 5.75% senior subordinated notes due 2022 USD ($) | Sep. 30, 2012 5.75% senior subordinated notes due 2022 USD ($) | Aug. 31, 2012 5.75% senior subordinated notes due 2022 Debt redemption prior to October 1, 2015 | Sep. 30, 2012 7.75% senior subordinated notes due 2016 USD ($) | Dec. 31, 2011 7.75% senior subordinated notes due 2016 USD ($) | Sep. 30, 2012 Mortgages USD ($) | Dec. 31, 2011 Mortgages USD ($) | Sep. 30, 2012 Other Debt Securities USD ($) | Dec. 31, 2011 Other Debt Securities USD ($)
Long Term Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | $ 830,847,000 | $ 850,191,000 |  |  | $ 132,000,000 | $ 110,000,000 | $ 127,000,000 |  | $ 45,256,000 |  | $ 59,060,000 |  |  | £ 25,500,000 | $ 41,216,000 |  |  |  | $ 3,113,000 |  | $ 13,333,000 |  |  |  |  |  | $ 63,324,000 |  | $ 550,000,000 |  |  | $ 375,000,000 | $ 73,549,000 | $ 75,684,000 | $ 7,713,000 | $ 4,790,000
Less: current portion | (14,929,000) | (3,414,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net long-term debt | 815,918,000 | 846,777,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.50% |  |  | 5.75% |  | 7.75% | 7.75% |  |  |  |
Principal amount redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 375,000,000 |  |  |  |  |
Percentage of principal amount at which the entity may redeem some or all of the notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Conversion rate of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.7796 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23.38 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion maximum threshold amount for holder to receive payment in cash equal to the lessor of (i) $1,000 or (ii) The conversion value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion minimum threshold amount for the holder to receive payment of cash, common stock or a combination of two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount of convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,546,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of remaining principal and interest on convertible notes in cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,778,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion balance paid in cash |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,909,000 |  |  |  |  |  |  |  |  |  |  |  |
Maximum credit available |  |  | 375,000,000 | 375,000,000 |  |  |  | 10,000,000 |  | 100,000,000 |  |  |  |  |  | 30,000,000 |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate of interest on loans |  |  | LIBOR |  |  | LIBOR |  |  | LIBOR | LIBOR |  |  |  |  |  |  |  |  | Bank of England Base Rate | Bank of England Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit basis spread on variable rate (as a percent) |  |  | 2.50% | 2.50% |  | 2.50% |  |  | 1.35% | 1.35% |  | 1.35% | 3.00% |  |  |  |  |  | 1.75% | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental interest rate for uncollateralized borrowings in excess of maximum limit (as a percent) |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding | 18,997,000 |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of term loan, quarterly installments |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Frequency of principal repayments |  |  |  |  |  |  |  |  |  |  |  |  |  | Quarterly |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final payment due December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Low end of interest rate, depending on UK subsidiaries ratios |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.675% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High end of interest rate, depending on UK subsidiaries ratios |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.325% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |
Specified equity offerings, percentage of debt which may be redeemed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |
Change of control, redemption price as a percentage of principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |
Sale of assets, redemption price as percentage of principal |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |
Balance outstanding under credit agreement |  |  |  |  |  |  |  |  | 48,369,000 | 29,926,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax expense on the extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,753,000 |  |  |  |  |
Redemption premium |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,755,000 |  |  |  |  |
Write off of unamortized deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,998,000 |  |  |  |  |

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- Definition The amount of the original debt being converted 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 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 32 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: 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 + Details
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