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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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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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