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Registration Statement, Stated Maximum Amount Available for Equity or Debt Offerings

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Sensitivity Analysis of Fair Value, Change in Compensation Cost Due to Change in Assumption, Impact of $1 Increase in Price of Common Stock

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Share-based Compensation Arrangement by Share-based Payment Award, Basis for Determining Award on Market Factors, Percentage

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Share-based Compensation Arrangement by Share-based Payment Award, Estimated Achievement Level, Percentage

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Share-based Compensation Arrangement by Share-based Payment Award Achieved Performance Adjustment, Number of Shares

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Share-based Compensation Arrangement by Share-based Payment Award, Actual Achievement Level, Percentage

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Share-based Compensation Arrangement by Share-based Payment Award, Award Performance Period

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Share-based Compensation Arrangement by Share-based Payment Award, Basis for Determining Award on Company Performance Factors, Percentage

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Share-based Compensation Arrangement by Share-based Payment Award, Estimated Weighted Average Achievement Level, Percentage

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Share-based Compensation Arrangement by Share-based Payment Award, Maximum Cash Value of Phantom Stock Unit Awards Granted During the Period

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The cash inflow from the additional capital contribution to the entity.

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-Name Accounting Standards Codification
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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of new stock issued during the period.

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Equity Transactions and Stock-Based Compensation Plans (Narrative - Annual Disclosures Only) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Apr. 30, 2017	May 15, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Registration Statement, Stated Maximum Amount Available for Equity or Debt Offerings					$ 300,000,000
Registration Statement, Amount Available for Equity or Debt Offerings	$ 234,600,000
Proceeds from Issuance or Sale of Equity [Abstract]
Proceeds from common stock, net of offering costs	$ 0	$ 65,430,000	$ 0
Number of Shares Available for Grant	3,204,802
Restricted Stock Units (RSUs) [Member]
Proceeds from Issuance or Sale of Equity [Abstract]
Award Vesting Period	3 years
Restricted Stock Units (RSUs) [Member] \| Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 5.61	$ 1.47	$ 4.08
Proceeds from Issuance or Sale of Equity [Abstract]
Equity Instruments Other than Options, Grants in Period	96,728
Achieved Performance Adjustment, Number of Shares	0
Restricted Stock Units (RSUs) [Member] \| Performance-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 7.75	0.00	6.66
Proceeds from Issuance or Sale of Equity [Abstract]
Basis for Determining Award on Individual Performance Factors Percentage	50.00%
Basis for Determining Award on Market Factors, Percentage	50.00%
Equity Instruments Other than Options, Grants in Period	563,469
Award Performance Period	3 years
Restricted Stock Units (RSUs) [Member] \| Performance-Based RSUs, 2014 [Member]
Proceeds from Issuance or Sale of Equity [Abstract]
Share-based Payment Award, Actual Achievement Level, Percentage				121.00%
Achieved Performance Adjustment, Number of Shares	54,429
Restricted Stock Units (RSUs) [Member] \| Performance-Based RSUs, 2015 and 2017 [Member]
Proceeds from Issuance or Sale of Equity [Abstract]
Share-based Payment Award, Estimated Weighted Average Achievement Level, Percentage	100.00%
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 2.75	$ 2.76	$ 7.40
Proceeds from Issuance or Sale of Equity [Abstract]
Award Vesting Period	1 year
Equity Instruments Other than Options, Grants in Period	167,272
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 483,000	$ 137,000	$ 368,000
Stock Options [Member]
Proceeds from Issuance or Sale of Equity [Abstract]
Award Vesting Period	3 years
Expiration Period	10 years
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 1.35
Proceeds from Issuance or Sale of Equity [Abstract]
Award Vesting Period	39 months	39 months
Basis for Determining Award on Individual Performance Factors Percentage	50.00%
Basis for Determining Award on Market Factors, Percentage	50.00%
Equity Instruments Other than Options, Grants in Period		1,268,068
Award Performance Period		3 years
Share-based Payment Award, Estimated Achievement Level, Percentage	150.00%
Share-based Payment Award, Maximum Cash Value of Phantom Stock Unit Awards		$ 8.08
Sensitivity Analysis of Fair Value, Change in Compensation Cost Due to Change in Assumption, Impact of $1 Increase in Price of Common Stock	$ 900,000
Common Stock [Member]
Proceeds from Issuance or Sale of Equity [Abstract]
Sale of common stock, net of offering costs, shares		12,075,000