Equity - Incentive Plan (Details) - $ / shares		12 Months Ended
	Oct. 29, 2018	Dec. 31, 2018	Dec. 31, 2017	Nov. 07, 2016
Stock Incentive Plans and Plan Amendment
Granted (in shares)		250,000
Common stock, par value (in dollars per share)		$ 0.10	$ 0.10
RSUs | Officer
Stock Incentive Plans and Plan Amendment
Number of shares of common stock authorized for issuance		5,200,000
2016 Plan
Stock Incentive Plans and Plan Amendment
Number of shares reserved for future issuance				3,529,109
Granted (in shares)		250,000
Maximum number of shares that can be awarded to any employee in one year	500,000
Shares Reserved For Future Issuance
Stock options granted under the incentive plans reserved for future issuance (in shares)		8,435,562
Shares of common stock issuable	12,725,963
2016 Plan | RSUs
Shares Reserved For Future Issuance
Shares of common stock issuable		2,364,393
Management Incentive Plan
Stock Incentive Plans and Plan Amendment
Number of shares of common stock authorized for issuance	1,776,500
Amended And Restated Plan
Shares Reserved For Future Issuance
Number of shares available for issuance		444