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Stock Plans - Restricted Stock and Performance Stock (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Restricted stock awards
Number of Awards
Non-vested at the beginning of the period (in shares) | shares	3,375
Granted (in shares) | shares	301
Vested (in shares) | shares	(1,341)
Forfeited (in shares) | shares	(825)
Non-vested at the end of the period (in shares) | shares	1,510
Period end Fair Value
Non-vested at the beginning of the period (in dollars per share) | $ / shares	$ 8.68
Granted (in dollars per share) | $ / shares	4.90
Vested (in dollars per share) | $ / shares	9.11
Forfeited (in dollars per share) | $ / shares	7.79
Non-vested at the end of the period (in dollars per share) | $ / shares	$ 7.05
Performance based cash units
Number of Awards
Non-vested at the beginning of the period (in shares) | shares	1,046
Granted (in shares) | shares	1,391
Vested (in shares) | shares	0
Forfeited (in shares) | shares	(1,530)
Non-vested at the end of the period (in shares) | shares	907
Period end Fair Value
Non-vested at the beginning of the period (in dollars per share) | $ / shares	$ 4.75
Granted (in dollars per share) | $ / shares	0
Vested (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	0
Non-vested at the end of the period (in dollars per share) | $ / shares	$ 4.70
Performance based cash units | 2015 Plan
Stockholder's Equity
Vesting period (in years)	3 years
First Anniversary | Restricted stock awards
Stockholder's Equity
Percentage of awards vesting	25.00%

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