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Share-Based Transactions - Impact of Equity Awards Granted (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Total equity awards expense recognized | $ 1,891 | $ 1,923 | $ 13,392 | $ 11,667
Expense Deferred [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Quarterly incentive awards expense deferred | $ 2,485 | $ 2,668 | $ 4,979 | $ 5,418

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