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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Cash paid for: |  |  |  |
Interest | $ 623 | $ 509 | $ 884 | $ 520
Income taxes | 405 | 2,525 | 924 | 3,123
Total | 1,028 | 3,034 | 1,808 | 3,643
Income Taxes |  |  |  |
Tax expense | $ 3,746 | $ 5,735 | $ 4,438 | $ 7,778
Effective tax rate (as a percent) |  |  | 37.40% | 41.30%
Federal statutory income taxes rate (as a percent) |  |  | 35.00% | 35.00%
State income taxes rate (as a percent) |  |  | 4.00% | 4.00%
Foreign income taxes rate (as a percent) |  |  |  | 2.90%
Noncontrolling interest (as a percent) |  |  | 2.40% |

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