Share-based Compensation (Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Options, Outstanding [Roll Forward]
Stock options outstanding, ending balance	109,499
Stock options, Exercisable	34,874
Stock Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Stock options, Weighted Average Exercise Price, beginning balance (in dollars per share)	$ 15.17	$ 16.41	$ 8.28
Stock options, Granted, Weighted Average Exercise Price (in dollars per share)	49.22	22.25	0.00
Stock options, Exercised, Weighted Average Exercise Price (in dollars per share)	11.38	20.25	1.75
Stock options, Canceled, Weighted Average Exercise Price (in dollars per share)			17.58
Stock options, Weighted Average Exercise Price, ending balance (in dollars per share)	30.73	$ 15.17	$ 16.41	$ 8.28
Stock options, Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 18.70
Stock Options, Additional Disclosures [Abstract]
Stock options outstanding, Weighted Average Remaining Contractual Term (in years)	3 years 3 months 12 days	2 years 3 months 25 days	1 year 10 months 17 days	1 year
Stock options, Exercisable, Weighted Average Remaining Contractual Term (in years)	2 years 6 months 18 days
Stock options outstanding, Aggregate Intrinsic Value	$ 2,882	$ 2,465	$ 121	$ 5,093
Stock options, Exercisable, Aggregate Intrinsic Value	1,337
Proceeds from stock options exercised	824	2,209	788
Stock Options
Stock Options, Additional Disclosures [Abstract]
Stock options exercised in period, intrinsic value	$ 3,200	$ 1,300	$ 5,300
Within Plans
Stock Options, Outstanding [Roll Forward]
Stock options outstanding, beginning balance	139,878	207,000	792,000
Stock options, Granted	42,000	42,000	0
Stock options, Exercised	(72,379)	(109,122)	(450,000)
Stock options, Canceled	0	0	(135,000)
Stock options outstanding, ending balance	109,499	139,878	207,000	792,000
Stock options, Exercisable	34,874
Employee and Non-employees [Member]
Stock Options, Outstanding [Roll Forward]
Stock options, Granted	0	0	0