20. Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Supplemental disclosures of Cash Flow Information:
Cash received for income taxes, net	$ (928)	$ (4,780)
Cash paid for interest	28,520	30,165
Supplemental disclosures of Non-cash Investing and Financing Activities:
Reclassification of treasury stock	0	5,571
Issuance of 1,100,498 shares in exchange transaction	3,775	0
Fair value of conversion option of exchangeable notes	12,690	0
Conversion of 4.25% Convertible notes	(51,775)	0
Issuance of Exchangeable Notes	$ 36,243	$ 0