Stock-Based Compensation - Stock Options Activity (Details) - On the settlement of employee stock purchase plan shares $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Stock Options
Options outstanding at the beginning of the period (in shares) | shares	154
Options outstanding at the end of the period (in shares) | shares	154
Options exercisable at the end of the period (in shares) | shares	154
Weighted Average Exercise Price Per Share
Options outstanding at the beginning of the period (usd per share) | $ / shares	$ 19.40
Options outstanding at end of period (usd per share) | $ / shares	19.40
Options exercisable at the end of period (usd per share) | $ / shares	$ 19.40
Weighted Average Remaining Life
Outstanding at the end of the period	7 months 6 days
Exercisable at the end of the period	7 months 2 days
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars) | $	$ 0
Intrinsic Value | $	$ 0