Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Basic and Diluted Earnings per Share [Line Items]
Net income (loss)	$ (72,534)	$ 44,521
Weighted-average common shares outstanding, basic (in shares)	25,014,027	25,130,961
Weighted-average common shares outstanding, diluted (in shares)	25,014,027	25,604,268
Earnings per common share, basic (in dollars per share)	$ (2.90)	$ 1.77
Earnings per common share, diluted (in dollars per share)	$ (2.90)	$ 1.74
Awards excluded from diluted earnings per share calculation (in shares)	379,282	63,897
Restricted Stock Unit Awards
Basic and Diluted Earnings per Share [Line Items]
Add dilutive effect of share-based awards outstanding (in shares)	0	260,829
Stock Options
Basic and Diluted Earnings per Share [Line Items]
Add dilutive effect of share-based awards outstanding (in shares)	0	212,478

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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