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The maximum consolidated leverage ratio, as defined in the line of credit agreement, which the reporting entity must maintain in order to be in compliance with the terms of the line of credit facility.

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The minimum fixed charge ratio, as defined in the line of credit agreement, which the reporting entity must maintain in order to be in compliance with the terms of the line of credit facility.

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Line Of Credit Increase, Removed By Amendment

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Maximum adjustment to the Applicable Rate.

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Percentage Of Foreign Restricted Subsidiary Stock Pledged As Collateral

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Face (par) amount of debt instrument at time of issuance.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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No definition available.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

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The net result for the period of deducting operating expenses from operating revenues.

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No definition available.

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Financial Commitments (Narrative) (Details)	3 Months Ended			6 Months Ended	12 Months Ended
Financial Commitments (Narrative) (Details)	Dec. 31, 2016	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2016	Dec. 31, 2015 USD ($)
Amended Credit Agreement [Abstract]
Operating Income (Loss)		$ 40,122,000	$ 20,084,000
Loan outstanding		825,733,000			$ 817,684,000
Senior Unsecured Notes [Member]
Amended Credit Agreement [Abstract]
Loan outstanding		297,366,000			297,118,000
Original Term Loan [Member]
Amended Credit Agreement [Abstract]
Face amount		250,000,000
Term Loan [Member]
Amended Credit Agreement [Abstract]
Loan outstanding		220,198,000			222,120,000
Original Facility [Member]
Amended Credit Agreement [Abstract]
Revolver optional increase removed by amendment		$ 300,000,000
Percentage of foreign restricted subsidiary stock pledged as collateral		65.00%
Original Facility [Member] \| Amendment Terms Based On Leverage Ratio Greater Than 3.5 to 1.0 [Member]
Amended Credit Agreement [Abstract]
Leverage ratio, Required		3.5
Maximum adjustment to Applicable Rate (as a percent)		1.00%
Original Facility [Member] \| Amendment Terms Based On Leverage Ratio Greater Than 4.0 to 1.0 [Member]
Amended Credit Agreement [Abstract]
Leverage ratio, Required		4.0
Maximum adjustment to Applicable Rate (as a percent)		1.00%
Original Facility [Member] \| Minimum [Member[
Amended Credit Agreement [Abstract]
Fixed charge coverage ratio, Required		1.25
Original Facility [Member] \| Minimum [Member[ \| Scenario Plan [Member]
Amended Credit Agreement [Abstract]
Leverage ratio, Required	3.00
Original Facility [Member] \| Maximum [Member] \| Scenario Plan [Member]
Amended Credit Agreement [Abstract]
Leverage ratio, Required	3.25	4.25		4.0
Original Revolver [Member]
Amended Credit Agreement [Abstract]
Loan outstanding		$ 178,738,000			155,815,000
Available borrowing capacity		116,300,000
Letters Of Credit [Member]
Amended Credit Agreement [Abstract]
Letters of credit outstanding		200,000			200,000
Revolver [Member]
Amended Credit Agreement [Abstract]
Maximum borrowing capacity		$ 300,000,000
Brightwater Matter [Member]
Amended Credit Agreement [Abstract]
Pre-tax charge					23,900,000
Five Star Electric [Member]
Amended Credit Agreement [Abstract]
Pre-tax charge					$ 45,600,000