Stock-Based Compensation (Options) (Details) - Stock Options [Member] $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Number of Shares
Options outstanding, beginning balance (in shares) | shares	1,826
Options granted (in shares) | shares	0
Options exercised (in shares) | shares	(313)
Options canceled (in shares) | shares	(1)
Options outstanding, ending balance (in shares) | shares	1,512
Options vested and expected to vest, outstanding (in shares) | shares	1,509
Options exercisable, end of period (in shares) | shares	1,440
Weighted-Average Exercise Price
Options outstanding, beginning balance (usd per share) | $ / shares	$ 21.33
Options granted (in dollars per share) | $ / shares	0.00
Options exercised (usd per share) | $ / shares	21.72
Options canceled (in dollars per share) | $ / shares	30.52
Options outstanding, ending balance (usd per share) | $ / shares	21.24
Options vested and expected to vest (usd per share) | $ / shares	21.23
Options exercisable, end of period (usd per share) | $ / shares	$ 20.72
Aggregate Intrinsic Value
Options outstanding, Aggregate Intrinsic Value | $	$ 27,152
Options vested and expected to vest, Aggregate Intrinsic Value | $	27,141
Options exercisable, Aggregate Intrinsic Value | $	$ 26,645
Weighted Average Remaining Contractual Term
Options outstanding, Weighted Average Remaining Contractual Term (in years)	4 years 304 days
Options vested and expected to vest, Weighted Average Remaining Contractual Term (in years)	4 years 9 months 28 days
Option exercisable, Weighted Average Remaining Contractual Term (in years)	4 years 8 months 13 days