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Recent Accounting Developments - Narratives (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Error Corrections and Prior Period Adjustments Restatement
Capitalized implementation costs		$ 400
Proceeds from insurance		252	$ 252	$ 0
Increase to net cash used in operating activities		284,923	174,487	$ 89,459
Subsequent Event | Forecasted
Error Corrections and Prior Period Adjustments Restatement
Right-of-use asset, less than					$ 20,000
Lease liability, less than					$ 20,000
ASU 2017-12
Error Corrections and Prior Period Adjustments Restatement
Cumulative effect from adoption of new accounting principle	$ 400		383
ASU 2016-15
Error Corrections and Prior Period Adjustments Restatement
Proceeds from insurance			300
Accumulated Other Comprehensive Loss
Error Corrections and Prior Period Adjustments Restatement
Adjustment related to TCJA	(300)	$ (300)
Accumulated Deficit
Error Corrections and Prior Period Adjustments Restatement
Adjustment related to TCJA	$ 300
Accumulated Deficit | ASU 2017-12
Error Corrections and Prior Period Adjustments Restatement
Cumulative effect from adoption of new accounting principle			$ 383

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