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Financial Commitments (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) item $ / shares shares | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2016 | Mar. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from debt |  | $ 200,000,000 |  |  |  |
Amortization (non-cash interest expense) | $ 300,000 |  | $ 800,000 |  |  |
Letters Of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  | 150,000,000 |  |  |  |
Letters of credit outstanding |  | $ 200,000 |  |  |  |
Convertible Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issuance date |  | Jun. 15, 2016 |  |  |  |
Face amount |  | $ 200,000,000 |  |  |  |
Interest rate |  | 2.875% |  |  |  |
Maturity date |  | Jun. 15, 2021 |  |  |  |
Conversion price, shares | shares |  | 33.0579 |  |  |  |
Conversion price, principal amount |  | $ 1,000 |  |  |  |
Conversion price | $ / shares |  | $ 30.25 |  |  |  |
Effective interest rates |  | 9.39% |  |  |  |
Convertible Notes [Member] | Circumstance One [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Business day period after consecutive trading day period |  | 5 days |  |  |  |
Consecutive trading day period |  | 10 days |  |  |  |
Percentage of conversion price |  | 98.00% |  |  |  |
Conversion price, principal amount |  | $ 1,000 |  |  |  |
Convertible Notes [Member] | Circumstance Two [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Business day period after consecutive trading day period |  | 20 days |  |  |  |
Percentage of conversion price |  | 130.00% |  |  |  |
Term Loan [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  | $ 250,000,000 |  |  |  |
Prepayment of debt |  | 125,000,000 |  |  |  |
2010 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  | $ 300,000,000 |  |  |  |
Interest rate |  | 7.625% |  |  |  |
Effective interest rates |  | 7.99% |  |  |  |
Minimum [Member[ | Convertible Notes [Member] | Circumstance Two [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Consecutive trading day period |  | 30 days |  |  |  |
Credit Facility [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Number of amendments | item |  | 2 |  |  |  |
Maximum adjustment to interest rate |  | 1.00% |  |  |  |
Revolver optional increase removed by amendment |  | $ 300,000,000 |  |  |  |
Percentage of foreign restricted subsidiary stock pledged as collateral |  | 65.00% |  |  |  |
Effective interest rates |  | 9.86% |  |  |  |
Outstanding borrowings |  | $ 139,300,000 |  |  |  |
Credit Facility [Member] | Amendment One [Member] | Minimum [Member[ |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Consolidated leverage ratio |  | 3.5 |  |  |  |
Credit Facility [Member] | Amendment One [Member] | Minimum [Member[ | Forecast [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Consolidated leverage ratio |  |  |  |  | 3.00 |
Credit Facility [Member] | Amendment One [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Consolidated leverage ratio |  | 4.25 |  |  |  | 4.00
Credit Facility [Member] | Amendment One [Member] | Maximum [Member] | Forecast [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Consolidated leverage ratio |  |  |  |  | 3.25 |
2014 Revolver [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of debt |  | $ 69,000,000 |  |  |  |
Maximum borrowing capacity |  | 300,000,000 |  |  |  |
Brightwater Matter [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Pre-tax charges |  |  |  | $ 23,900,000 |  |
Five Star Electric [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Pre-tax charges |  |  |  | $ 45,600,000 |  |
Liability Component [Member] | Convertible Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount |  | 200,000,000 |  |  |  |
Conversion feature |  | 46,800,000 |  |  |  |
Proceeds from debt |  | 153,200,000 |  |  |  |
Debt issuance costs |  | 5,063,000 |  |  |  |
Amortization (non-cash interest expense) |  | 2,405,000 |  |  |  |
Equity Component [Member] | Convertible Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Conversion feature |  | 46,800,000 |  |  |  |
Debt issuance costs |  | $ 1,547,000 |  |  |  |

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