Stockholders' Equity - Non-Controlling Interest (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Oct. 31, 2013	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Class of Stock [Line Items]
Total number of shares of common stock originally issuable upon the exchange of PDH common stock pursuant to the RHSA (in shares)	8,774,527
PDH
Class of Stock [Line Items]
Common stock issued in connection with exchange of PDH common stock (in shares)		4,648,395		4,648,395
Mac Dermid
Class of Stock [Line Items]
Equity instruments		$ 97,500		$ 97,500
Noncontrolling interest percentage (as a percent)		3.30%	4.60%	3.30%	4.60%
Net income (loss) allocated to Retaining Holders		$ (600)	$ 0	$ 600	$ 1,900