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Financial Commitments (Narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
item
$ / shares
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Debt Instrument [Line Items]              
Proceeds from debt   $ 200,000,000        
Amortization (non-cash interest expense) $ 300,000   $ 600,000        
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          
Payment of debt issuance fees   $ 6,000,000          
Conversion price, shares | shares   33.0579          
Conversion price, principal amount   $ 1,000          
Conversion price | $ / shares   $ 30.25          
Effective interest rates   9.37%          
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          
Senior Notes [Member]              
Debt Instrument [Line Items]              
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   9.66%          
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             4.00
Credit Facility [Member] | Amendment One [Member] | Maximum [Member] | Forecast [Member]              
Debt Instrument [Line Items]              
Consolidated leverage ratio         3.25 4.25  
Revolver [Member]              
Debt Instrument [Line Items]              
Repayment of debt   $ 69,000,000          
Maximum borrowing capacity   300,000,000          
Outstanding borrowings   145,800,000          
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   4,934,000          
Amortization (non-cash interest expense)   340,000          
Equity Component [Member] | Convertible Notes [Member]              
Debt Instrument [Line Items]              
Conversion feature   46,800,000          
Debt issuance costs   $ 1,507,000