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Acquisitions (Details) (USD $) | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 Trade Name [Member] | Dec. 31, 2012 WBI [Member] | Jun. 06, 2011 WBI [Member] | Dec. 31, 2012 Akimeka, LLC [Member] | Dec. 31, 2010 Akimeka, LLC [Member] | Aug. 19, 2010 Akimeka, LLC [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 180,000,000 |  |  | $ 33,000,000
Prepaid employee compensation |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |  |  | 725,000
Acquisition cost, net of retention bonuses |  |  |  |  |  |  |  |  |  |  |  |  |  | 178,100,000 |  |  | 32,300,000
Revenue of acquisition |  |  |  |  |  |  |  |  | 148,073,000 | 90,684,000 | 12,973,000 |  |  |  |  |  |
Operating income | 11,764,000 | 14,267,000 | 12,552,000 | 12,493,000 | 11,113,000 | 11,228,000 | 7,059,000 | 6,677,000 | 51,076,000 | 36,077,000 | 37,940,000 |  |  |  |  |  |
Income taxes paid to sellers |  |  |  |  |  |  |  |  | 10,686,000 | 12,625,000 | 15,466,000 |  |  |  |  |  |
Maximum potential cash payment |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  | 11,000,000 |  |
Period of Additional Payments to Sellers |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 3 |  |
Earn-out obligations, less current portion |  |  |  |  |  |  |  |  |  |  |  |  | 9,100,000 |  |  |  |
Earn-out obligation adjustment |  |  |  |  |  |  |  |  | 4,337,000 | 2,486,000 | 0 |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful Life of intangible assets |  |  |  |  |  |  |  |  |  |  |  | 8 years 9 months 18 days |  |  |  |  |
Acquisition date fair value of earn-out obligation | 9,098,000 |  |  |  | 16,415,000 |  |  |  | 9,098,000 | 16,415,000 |  |  |  |  |  |  |
Additional cash consideration based on final working capital calculation |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  | 363,000 |
Earn-out payments |  |  |  |  |  |  |  |  | (7,133,000) |  |  |  | 7,100,000 |  |  |  |
Earn Out Obligations Fair Value Disclosure | $ 9,098,000 |  |  |  | $ 16,415,000 |  |  |  | $ 9,098,000 | $ 16,415,000 |  |  |  |  |  |  |

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