Equity-Based Compensation (Narrative) (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($) shares	Sep. 30, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock Unit, Vested, Issuance Deferred	74,989	74,989
Qualifying terminations, recognition of expense \| $	$ 3	$ 1,767
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares reserved for future issuance	146,502	146,502
Performance shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost \| $	$ 5,800	$ 5,800
Weighted average period (in years)		1 year
Restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost \| $	$ 2,000	$ 2,000
Weighted average period (in years)		1 year
Replacement Restricted Stock Unit Awards [Member] \| Deltic [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting terms		4 years
Qualifying terminations, accelerated vesting shares		35,000
Qualifying terminations, recognition of expense \| $		$ 1,800
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	1,600,000	1,600,000
2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	1,000,000	1,000,000
2005 and 2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	400,000	400,000
2002 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized	250,000	250,000

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+ References

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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+ References

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Number of shares for which recognition of compensation cost was accelerated.

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