Shareholders’ Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning of period			$ 79,173
Unrealized gains, net of tax effects of $1, $3, $1 and $5		$ 6	3	$ 10
Total other comprehensive income (loss)	$ (1,602)	652	(1,205)	1,250
Accumulated other comprehensive loss balance, end of period	68,370		68,370
Total accumulated other comprehensive loss, end of period	(60,752)	(60,395)	(60,752)	(60,395)	$ (59,547)
Investments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning of period	3	(2)	2	(6)
Unrealized gains, net of tax effects of $1, $3, $1 and $5	2	6	3	10
Total other comprehensive income (loss)	2	6	3	10
Accumulated other comprehensive loss balance, end of period	5	4	5	4
Accumulated Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized gains (losses), tax effects	1	3	1	5
Foreign currency translation
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive income (loss), beginning of period	(59,153)	(61,045)	(59,549)	(61,639)
Translation adjustments	(1,604)	646	(1,208)	1,240
Total other comprehensive income (loss)	(1,604)	646	(1,208)	1,240
Accumulated other comprehensive loss balance, end of period	$ (60,757)	$ (60,399)	$ (60,757)	$ (60,399)