Description of Business and Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	$ 1,405	$ 1,756	$ 1,015
Additions	670	121	782
Deductions	(128)	(472)	(41)
Ending balance	$ 1,947	$ 1,405	$ 1,756