Stock-Based Compensation - Restricted Stock and Restricted Stock Units (Details) shares in Thousands	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Restricted shares
Number of Shares
Number of shares unvested, beginning of period (in shares) | shares	495
Number of shares, granted (in shares) | shares	0
Number of shares, vested (in shares) | shares	(198)
Number of shares, forfeited (in shares) | shares	0
Number of shares unvested, end of period (in shares) | shares	297
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, beginning of period (in usd per share) | $ / shares	$ 4.25
Weighted average grant date fair value, granted (in usd per share) | $ / shares	0
Weighted average grant date fair value, vested (in usd per share) | $ / shares	4.25
Weighted average grant date fair value, forfeited (in usd per share) | $ / shares	0
Weighted average grant date fair value, end of period (in usd per share) | $ / shares	$ 4.25
Restricted stock units
Number of Shares
Number of shares unvested, beginning of period (in shares) | shares	2,894
Number of shares, granted (in shares) | shares	3,372
Number of shares, vested (in shares) | shares	(569)
Number of shares, forfeited (in shares) | shares	(261)
Number of shares unvested, end of period (in shares) | shares	5,436
Weighted Average Grant Date Fair Value
Weighted average grant date fair value, beginning of period (in usd per share) | $ / shares	$ 26.34
Weighted average grant date fair value, granted (in usd per share) | $ / shares	27.86
Weighted average grant date fair value, vested (in usd per share) | $ / shares	29.04
Weighted average grant date fair value, forfeited (in usd per share) | $ / shares	25.71
Weighted average grant date fair value, end of period (in usd per share) | $ / shares	$ 27.03