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Business Combinations (Narrative) (Details) - USD ($) |  | 3 Months Ended
--- | --- | ---
Dec. 08, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Business Acquisition [Line Items] |  |  |
Revenue |  | $ 331,555,000 | $ 273,255,000
Net income |  | $ 28,139,000 | 22,829,000
Rouse Services LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Total consideration | $ 251,724,000 |  |
Cash consideration | 250,265,000 |  |
Cash consideration, placed in escrow | $ 2,169,000 |  |
Common stock consideration (in shares) | 312,193 |  |
Vesting period | 3 years |  |
Common stock consideration fair value | $ 1,459,000 |  |
Shares forfeited |  | 55,510 |
Reversal of share based continuing employment costs |  | $ 98,000 |
Number of common shares expected to vest |  | 256,683 |
Unrecognized share based continuing employment costs |  | $ 14,576,000 | $ 0
Acquisition-related costs for legal, advisory, integration and other professional fees |  | 2,922,000 |
Acquisition related share based continuing employment costs |  | $ 2,553,000 |
Rouse Services LLC [Member] | Employment Costs [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Common stock consideration fair value | $ 20,735,000 |  |

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- Definition Period over which grantee's right to exercise award under business combination arrangement over the service period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References No definition available. + Details
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