|
Changes in Fair Value of Contingent Consideration Obligations (Details) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|
| Contingent Consideration Obligations [Roll Forward] | |||||||
| Beginning balance | $ 49,473 | $ 88,037 | $ 90,009 | $ 82,382 | $ 82,382 | $ 2,000 | |
| Contingent consideration liabilities recorded for business acquisitions | 1,204 | 3,854 | 5,540 | 5,456 | 81,239 | 2,000 | |
| Payments | (38,349) | (600) | (3,100) | ||||
| Loss (gain) included in earnings | 712 | 1,892 | 1,765 | 1,787 | 1,643 | (1,408) | |
| Exchange rate effects | 3,096 | 2,353 | (2,794) | 3,173 | 3,628 | 551 | |
| Ending balance | $ 54,485 | $ 92,282 | $ 54,485 | $ 92,282 | $ 90,009 | $ 82,382 | $ 2,000 |