Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

Changes in components of accumulated other comprehensive loss (in thousands):

		Years Ended December 31,
		2017			2016		2015
Investments
	Accumulated other comprehensive income (loss), beginning of period	$	(6	)	$	1,297	$	2,252
	Unrealized gains (losses), net of tax effects of $4, $10, and $0	8			1,647		(562		)

	Reclassification adjustments for losses (gains) included in other income (expense), net of tax effects of $0, $0, and $0	—			(2,950		)	(393		)
	Net current period other comprehensive (income) loss	8			(1,303		)	(955		)
	Accumulated other comprehensive (income) loss balance, end of period	$	2		$	(6	)	$	1,297
Foreign currency translation
	Accumulated other comprehensive loss, beginning of period	$	(61,639	)	$	(60,777	)	$	(57,504	)
	Translation adjustments	2,090			(1,134		)	(3,009		)
	Reclassification adjustments for losses (gains) included in other income (expense)	—			272			(264		)
	Net current period other comprehensive income	2,090			(862		)	(3,273		)
	Accumulated other comprehensive loss balance, end of period	$	(59,549	)	$	(61,639	)	$	(60,777	)
Total accumulated other comprehensive loss, end of period		$	(59,547	)	$	(61,645	)	$	(59,480	)