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Basis of Presentation - Calculations of Basic and Diluted Earnings per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 14, 2017 $ / shares | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Jun. 30, 2017 USD ($) $ / shares shares | Jun. 30, 2016 USD ($) $ / shares shares | Dec. 31, 2016 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |
Dividends declared (in dollars per share) | $ / shares | $ 0.25 | $ 0.25 | $ 0 | $ 0.25 | $ 0 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Net income | $ |  | $ 6,408 | $ 7,860 | $ 15,096 | $ 12,236 | $ 97,700
Less: Undistributed income allocated to participating securities | $ |  | 45 | 83 | 140 | 109 |
Income attributable to common stockholders | $ |  | $ 6,363 | $ 7,777 | $ 14,956 | $ 12,127 |
Basic weighted-average common shares outstanding (in shares) |  | 21,866 | 21,875 | 21,961 | 21,895 |
Add: dilutive effect of equity instruments (in shares) |  | 14 | 312 | 20 | 309 |
Diluted weighted-average shares outstanding (in shares) |  | 21,880 | 22,187 | 21,981 | 22,204 |
Earnings per share - basic (in dollars per share) | $ / shares |  | $ 0.29 | $ 0.36 | $ 0.68 | $ 0.55 |
Earnings per share - diluted (in dollars per share) | $ / shares |  | $ 0.29 | $ 0.35 | $ 0.68 | $ 0.55 |
Performance share units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total shares excluded from diluted shares outstanding |  | 400 | 400 | 200 | 200 |
Performance share units | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Range of contingent right to receive a common stock |  |  |  | 0 |  |
Performance share units | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Range of contingent right to receive a common stock |  |  |  | 2 |  |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total shares excluded from diluted shares outstanding |  | 200 | 200 | 200 | 200 |

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