Acquisitions - Noralta Business Acquisition (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
	Apr. 02, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 29, 2018
Business Acquisition [Line Items]
Common share price (in usd per share)					$ 3.77
Cash consideration		$ 16,434	$ 171,337	$ 0
Noralta
Business Acquisition [Line Items]
Cash consideration	$ 157,539
Total purchase consideration	340,203
Less: Common shares held in escrow	(8,825)
Less: Cash held in escrow	(11,607)
Less: Preferred Shares held in escrow	(4,221)
Total purchase consideration	$ 315,550
Common Shares | Noralta
Business Acquisition [Line Items]
Common shares issued (in shares)	32,791
Common share and preferred share consideration	$ 123,622
Preferred Shares | Noralta
Business Acquisition [Line Items]
Common share and preferred share consideration	$ 59,042