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Debt (Line of Credit Facility) (Details) In Thousands, unless otherwise specified |  | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 USD ($) | Sep. 30, 2012 JPMorgan Chase Bank, National Association [Member] USD ($) | Sep. 30, 2012 Amended Prudential Investment Management [Member] USD ($) | Sep. 30, 2012 Series A Notes [Member] USD ($) | Sep. 30, 2012 Series B Notes [Member] USD ($) | Sep. 30, 2012 Royal Bank of Scotland N.V. [Member] USD ($) | Sep. 30, 2012 Royal Bank of Scotland N.V. [Member] EUR (€) | Sep. 30, 2012 HSBC Bank (China) Company Limited, Shanghai Branch [Member] USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, Maximum borrowing capacity |  | $ 125,000 | $ 80,000 |  |  | $ 2,576 | € 2,000 | $ 5,000
Amount of additional line of credit borrowing available |  | 62,500 |  |  |  |  |  |
Line of credit facility, Expanded Maximum borrowing capacity |  | 187,500 |  |  |  |  |  |
Line of credit facility, Amount outstanding |  | 10,000 | 20,000 |  |  |  |  |
Line of credit facility, weighted average interest rate at end of period (in hundredths) |  | 1.75% |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 10,000 | 10,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.00% | 4.10% |  |  |
Debt Instrument, Payment Terms |  |  |  | 7 year term | 10 year term |  |  |
Debt Instrument, Maturity Date Range, Start |  |  |  | 2014 | 2015 |  |  |
Debt Instrument, Maturity Date Range, End |  |  |  | 2018 | 2021 |  |  |
Credit Facilities [Abstract] |  |  |  |  |  |  |  |
Line of credit facility, Expiration date |  | May 5, 2016 | July 24, 2015 |  |  |  |  |
Sublimit on borrowings by foreign subsidiaries |  | 100,000 |  |  |  |  |  |
Line of credit facility, Minimum commitment fee percentage (in hundredths) |  | 0.25% |  |  |  |  |  |
Line of credit facility, Maximum commitment fee percentage (in hundredths) |  | 0.40% |  |  |  |  |  |
Interest rate spread added to federal funds rate (in hundredths) |  | 0.50% |  |  |  |  |  |
Interest rate spread added to LIBOR rate for one month (in hundredths) |  | 1.00% |  |  |  |  |  |
Minimum interest rate spread added to LIBOR rate for one month based on leverage ratio (in hundredths) |  | 0.50% |  |  |  |  |  |
Maximum interest rate spread added to LIBOR rate for one month based on leverage ratio (in hundredths) |  | 1.10% |  |  |  |  |  |
Percentage stock of certain first tier foreign subsidiaries pledged as collateral under the credit agreement (in hundredths) |  | 65.00% |  |  |  |  |  |
Line of credit facility, Covenant restriction, Maximum Indebtedness to EBITDA |  | 3.00 to 1 | 3.00 to 1 |  |  |  |  |
Line of credit facility, Covenant restriction, Minimum EBITDA to interest expense |  | 3.50 to 1 |  |  |  |  |  |
Line of credit facility, Covenant restriction, Maximum leverage ratio restricting paying of dividends or repurchasing stock |  | 2.00 to 1 | 2.00 to 1 |  |  |  |  |
Restriction on dividends and repurchases of common stock, Minimum |  | 50,000 | 50,000 |  |  |  |  |
Restriction on dividends and repurchases of common stock, Maximum |  | 75,000 | 75,000 |  |  |  |  |
Line of credit facility, Covenant restriction, Minimum leverage ratio restricting ability to make acquisitions |  | 2.75 to 1 | 2.75 to 1 |  |  |  |  |
Line of credit facility, Covenant restriction, Maximum level that can be paid for acquisitions |  | 25,000 | 25,000 |  |  |  |  |
Original Debt Amount Owed To Previous Owners Of An Acquired Business | 1,500 |  |  |  |  |  |  |
Amount outstanding on notes payable to owners of acquired entity | $ 750 |  |  |  |  |  |  |

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