Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Income tax paid	$ 7,855	$ 33,281	$ 30,154
Operating loss carryforwards, valuation allowance increased	210	458	498
Unrecognized tax benefits	396	1,232	$ 915
Unrecognized tax benefits that would impact effective tax rate	300	800
CANADA
Income Taxes [Line Items]
Operating loss carryforwards, valuation allowance increased	836
Currency exchange loss	(626)
Net operating losses carryforwards	$ 11,797	$ 8,577
Operating loss carryforwards, expiration year	2030
Operating loss carryforwards, offset period	20 years