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Financial Commitments (Narrative) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
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

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