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Derivative Instruments (Gains And Losses On Derivatives Designated As Cash Flow Hedges) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net $ 5,400,000 $ (9,700,000) $ (8,500,000)  
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) 12,400,000 (1,000,000) 400,000  
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) 1,900,000 (1,900,000) (700,000)  
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Interest Rate Lock Contracts [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net [1] 0 0 0  
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) [1],[2] 200,000 200,000 200,000  
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) [1],[3] 0 0 0  
Designated as Hedging Instrument [Member] | Cash Flow Hedges [Member] | Foreign Currency Forward Contracts [Member]        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net [4]   (9,700,000) 8,500,000 $ (5,400,000)
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) [2],[4]   (1,200,000) 200,000 12,200,000
Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) [3],[4]   (1,900,000) (700,000) $ 1,900,000
Derivative, Notional Amount   187,800,000    
Contract Drilling [Member] | Foreign Currency Forward Contracts [Member]        
Derivative [Line Items]        
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) (13,100,000) 400,000 (1,100,000)  
Depreciation Expense [Member] | Foreign Currency Forward Contracts [Member]        
Derivative [Line Items]        
Gain (Loss) Reclassified from AOCI into Income (Effective Portion) $ 900,000 $ 800,000 $ 900,000  
[1] Losses on interest rate lock derivatives reclassified from AOCI into income were included in interest expense, net, in our consolidated statements of operations.
[2] Changes in the fair value of cash flow hedges are recorded in AOCI. Amounts recorded in AOCI associated with cash flow hedges are subsequently reclassified into contract drilling, depreciation or interest expense as earnings are affected by the underlying hedged forecasted transaction.
[3] Gains and losses recognized in income for amounts excluded from effectiveness testing were included in other, net, in our consolidated statements of operations.
[4] During the year ended December 31, 2018, $400,000 of gains were reclassified from AOCI into contract drilling expense and $800,000 of gains were reclassified from AOCI into depreciation expense in our consolidated statement of operations. During the year ended December 31, 2017, $1.1 million of losses were reclassified from AOCI into contract drilling expense and $900,000 of gains were reclassified from AOCI into depreciation expense in our consolidated statement of operations. During the year ended December 31, 2016, $13.1 million of losses were reclassified from AOCI into contract drilling and $900,000 of gains were reclassified from AOCI into depreciation expense in our consolidated statement of operations.