Stock Incentive Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Number Of Shares (in thousands)
Outstanding, beginning balance (in shares)	1,284
Options exercised (in shares)	(40)
Options forfeited/expired/canceled (in shares)	(285)
Outstanding, ending balance (in shares)	959	1,284
Exercisable, end of period (in shares)	792
Vested and expected to vest, end of period (in shares)	950
Weighted Average Exercise Price
Outstanding, beginning balance (in usd per share)	$ 22.66
Options exercised (in usd per share)	18.22
Options forfeited/expired/canceled (in usd per share)	19.88
Outstanding, ending balance (in usd per share)	23.67	$ 22.66
Exercisable, end of period (in usd per share)	22.92
Vested and expected to vest, end of period (in usd per share)	$ 23.63
Other Disclosures
Outstanding, weighted-average remaining contractual term	3 years 7 months 13 days	3 years 2 months 4 days
Exercisable, weighted-average remaining contractual term	3 years 2 months 23 days
Vested and expected to vest, weighted-average remaining contractual term	3 years 7 months 6 days
Outstanding, aggregated intrinsic value	$ 522	$ 3,171
Exercisable, aggregated intrinsic value	522
Vested and expected to vest, aggregated intrinsic value	$ 522

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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