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Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Increase in cash flows provided by investing activities | $ (18,454) | $ 9,324
Decrease in cash flows provided by financing activities | (67,171) | (1,888)
Correction for payments related to deferred purchase price obligation of previous acquisitions | Reclassification Adjustment |  |
Increase in cash flows provided by investing activities |  | 1,200
Decrease in cash flows provided by financing activities |  | $ 1,200

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