Stock-Based Compensation - Estimated Annual Expense (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Estimated Annual Stock-Based Compensation Expense
2017	$ 5,605
2018	5,929
2019	1,569
2020	175
2021	59
Total	$ 13,337

Share-based Compensation Arrangement, Future Expense, Five Years

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Share-based Compensation Arrangement, Future Expense, Four Years

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Share-based Compensation Arrangement, Future Expense, Three Years

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Share-based Compensation Arrangement, Future Expense, Two Years

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Share-based Compensation Arrangements, Future Expense

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Share-based Compensation Arrangement, Future Expense, Next Twelve Months

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