Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning of period	$ 2,854	$ 1,526	$ 1,369
Changes in tax positions of prior years	214	912	84
Additions based on tax positions related to the current year	1,252	866	603
Payments	0	(85)	0
Closure of tax years	(573)	(365)	(530)
Balance at end of period	$ 3,747	$ 2,854	$ 1,526