Stock Based Compensation - RSU, PSU Activity (Details)	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Restricted Stock Units
Units
Unvested stock units, beginning of period (in shares) | shares	1,099,901
Granted (in shares) | shares	686,345
Vested (in shares) | shares	(213,846)
Forfeited (in shares) | shares	0
Unvested stock units, end of period (in shares) | shares	1,572,400
Weighted Average Grant Date Fair Value
Unvested stock units, beginning of period (in dollars per share) | $ / shares	$ 12.97
Granted (in dollars per share) | $ / shares	7.45
Vested (in dollars per share) | $ / shares	12.68
Forfeited (in dollars per share) | $ / shares	0
Unvested stock units, end of period (in dollars per share) | $ / shares	$ 10.60
Performance Stock Units
Units
Unvested stock units, beginning of period (in shares) | shares	701,128
Granted (in shares) | shares	401,958
Vested (in shares) | shares	(8,334)
Forfeited (in shares) | shares	0
Unvested stock units, end of period (in shares) | shares	1,094,752
Weighted Average Grant Date Fair Value
Unvested stock units, beginning of period (in dollars per share) | $ / shares	$ 14.31
Granted (in dollars per share) | $ / shares	6.14
Vested (in dollars per share) | $ / shares	14.58
Forfeited (in dollars per share) | $ / shares	0
Unvested stock units, end of period (in dollars per share) | $ / shares	$ 11.31