Supplemental Cash Flow Information - Supplemental Cash Flow Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Interest paid	$ 13,436	$ 7,244	$ 8,067
Income taxes paid	14,984	$ 455	$ 417
Computer software
Finite-Lived Intangible Assets [Line Items]
Intangible software assets acquired	$ 7,100