Significant Accounting Policies, Goodwill (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Segment	Sep. 30, 2015 USD ($)
Goodwill [Abstract]
Number of reporting segments | Segment				1
Non-cash impairment charge	$ 0	$ 0	$ 14,240	$ 0	$ 14,240
Tax benefit associated with goodwill impairment charge			$ (1,300)