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Derivative Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2018
Derivative [Line Items]  
Schedule of Interest Rate Derivatives [Table Text Block]
The following table summarizes the Company's interest rate swap agreements that were settled during the nine months ended September 30, 2018 (dollars in thousands):
 
 
 
 
Notional Amount
 
 
 
 
Effective Date
 
Settlement Date
 
Date
 
Amount
 
Pay Fixed Rate
 
Receive Variable Rate
9/30/2016
 
8/15/2018
 
9/30/2026
 
$
100,000

 
2.76%
 
1-month LIBOR
9/30/2016
 
8/15/2018
 
9/30/2026
 
$
100,000

 
2.74%
 
1-month LIBOR
9/30/2016
 
8/15/2018
 
9/30/2026
 
$
100,000

 
2.73%
 
1-month LIBOR
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
The following table summarizes the fair value of the Company's derivative instruments recorded in the consolidated balance sheets as of September 30, 2018 and December 31, 2017 (dollars in thousands):
 
 
 
Fair Value
 
Balance Sheet Location
 
September 30,
2018
 
December 31, 2017
Asset Derivatives:
 
 
 
 
 
Derivatives designated as hedges:
 
 
 
 
 
Interest rate swap agreements
Prepaid expenses and other
 
$
527

 
$

Foreign currency forward contracts
Prepaid expenses and other
 
383

 

Interest rate swap agreements
Other assets
 
6,596

 

British pound forward contracts
Other assets
 
20,803

 
13,657

Total derivatives designated as hedges
 
 
$
28,309

 
$
13,657

Derivatives not designated as hedges:
 
 
 
 
 
Cross-currency swap contract
Prepaid expenses and other
 
$
16,648

 
$
5,775

Cross-currency swap contract
Other assets
 

 
2,887

Total derivatives not designated as hedges
 
 
$
16,648

 
$
8,662

 
 
 
 
 
 
Liability Derivatives:
 
 
 
 
 
Derivatives designated as hedges:
 
 
 
 
 
Interest rate swap agreements
Accrued expenses
 
$
755

 
$
1,972

Interest rate swap agreements
Other long-term liabilities
 
1,706

 
12,410

British pound forward contracts
Other long-term liabilities
 
246

 
829

Total derivatives designated as hedges
 
 
$
2,707

 
$
15,211

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]
The following table shows the effect of the Company's derivative instruments designated as cash flow hedges for the three and nine months ended September 30, 2018 and 2017 in other comprehensive income (OCI) (dollars in thousands):
 
 
Total Cash Flow Hedge OCI Activity,
Net of Tax
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2018
 
2017
 
2018
 
2017
Derivatives Designated as Cash Flow Hedges:
 
 
 
 
 
 
 
 
Effective portion of net changes in fair value recognized in OCI, net of tax:
 
 
 
 
 
 
 
 
Interest rate swap agreements
 
$
4,816

 
$
388

 
$
14,396

 
$
(1,382
)
Foreign currency forward contracts
 
(13
)
 

 
275

 

British pound forward contracts, net (a)
 
350

 
348

 
85

 
2,020

 
 
$
5,153

 
$
736

 
$
14,756

 
$
638


(a)
The three and nine months ended September 30, 2018 represented a net gain of $2.0 million and $5.5 million, respectively, for the mark-to-market of the British pound forward contracts, offset by a net loss of $1.7 million and $5.4 million, respectively, for the mark-to-market of the U.K. intercompany loan. The three and nine months ended September 30, 2017 represented a net gain of $3.2 million and $8.6 million, respectively, for the mark-to-market of the U.K. intercompany loan, offset by a net loss of $2.8 million and $6.6 million, respectively, for the mark-to-market of the British pound forward contracts.
Schedule of Derivative Instruments, Gain (Loss) in Consolidated Statement of Operations [Table Text Block]
The following table shows the effect of the Company's derivative instruments not designated as hedges for the three and nine months ended September 30, 2018 and 2017 in the consolidated statements of operations (dollars in thousands):
 
 
 
 
Amount Recognized in Earnings
 
 
Location of Amount Recognized in Earnings
 
Three Months Ended
 
Nine Months Ended
 
 
 
September 30,
 
September 30,
 
 
 
2018
 
2017
 
2018
 
2017
Derivative Instruments Not Designated as Hedges:
 
 
 
 
 
 
 
 
 
 
Cross-currency swap agreements
 
Interest expense
 
$

 
$
(1,887
)
 
$

 
$
(1,887
)
Cross-currency swap agreements, net (a)
 
Other income/(loss), net
 
(2,410
)
 
(842
)
 
(4,900
)
 
(4,510
)
 
 
 
 
$
(2,410
)
 
$
(2,729
)
 
$
(4,900
)
 
$
(6,397
)

(a)
The three months ended September 30, 2018 represented a net gain of $0.6 million for the mark-to-market of the Swaps, offset by a net loss of $3.0 million for the mark-to-market of the GRail Intercompany Loan. The nine months ended September 30, 2018 represented a net gain of $3.2 million for the mark-to-market of the Swaps, partially offset by a net loss of $8.1 million for the mark-to-market of the GRail Intercompany Loan. The three and nine months ended September 30, 2017 represented a net gain of $1.7 million and $2.0 million, respectively, for the mark-to-market of the Swaps, offset by a net loss of $2.5 million and $6.5 million, respectively, for the mark-to-market of the GRail Intercompany Loan.
Interest Rate Swap [Member]  
Derivative [Line Items]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
The following table summarizes the terms of the Company's outstanding interest rate swap agreements entered into to manage the Company's exposure to changes in interest rates on its variable rate debt (amounts in thousands):
 
 
 
 
Notional Amount
 
 
 
 
Effective Date
 
Expiration Date
 
Date
 
Amount
 
Pay Fixed Rate
 
Receive Variable Rate
12/1/2016
 
12/1/2021
 
12/1/2021
 
A$
372,600

 
2.44%
 
AUD-BBR
12/1/2016
 
12/1/2021
 
12/1/2021
 
A$
110,746

 
2.44%
 
AUD-BBR
12/1/2016
 
12/1/2021
 
12/1/2021
 
A$
34,155

 
2.44%
 
AUD-BBR
8/31/2018
 
8/31/2021
 
8/31/2021
 
$
100,000

 
2.70%
 
1-month LIBOR
8/31/2018
 
8/31/2021
 
8/31/2021
 
$
100,000

 
2.71%
 
1-month LIBOR
8/31/2018
 
8/31/2048
 
8/31/2048
 
$
100,000

 
2.84%
 
1-month LIBOR
8/31/2018
 
8/31/2048
 
8/31/2048
 
$
100,000

 
2.87%
 
1-month LIBOR
8/31/2018
 
8/31/2048
 
8/31/2048
 
$
100,000

 
2.84%
 
1-month LIBOR
Foreign Currency Forward [Member]  
Derivative [Line Items]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
The following table summarizes the Company's outstanding foreign currency forward contracts associated with assets to be purchased by GWA in United States dollars within the next six months (dollars in thousands):
Effective date
 
Settlement Date
 
Notional Amount
 
Exchange Rate (AUD to USD)
5/2/2018
 
11/5/2018
 
$4,315
 
0.75
5/2/2018
 
12/21/2018
 
$5,753
 
0.75
Schedule of Derivative Instruments [Table Text Block]
The following table summarizes the Company's outstanding foreign currency forward contracts associated with assets to be purchased by GWA in United States dollars within the next six months (dollars in thousands):
Effective date
 
Settlement Date
 
Notional Amount
 
Exchange Rate (AUD to USD)
5/2/2018
 
11/5/2018
 
$4,315
 
0.75
5/2/2018
 
12/21/2018
 
$5,753
 
0.75

The following table summarizes the Company's foreign currency forward contract that was settled during the nine months ended September 30, 2018 (dollars in thousands):
Effective date
 
Settlement Date
 
Notional Amount
 
Exchange Rate (AUD to USD)
4/18/2018
 
7/5/2018
 
$5,379
 
0.78
British Pound Foreign currency forward contracts [Member]  
Derivative [Line Items]  
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
The following table summarizes the Company's outstanding British pound forward contracts (British pounds in thousands):
Effective Date
 
Settlement Date
 
Notional Amount
 
Exchange Rate (GBP to USD)
3/25/2015
 
3/31/2020
 
£60,000
 
1.51
3/25/2015
 
3/31/2020
 
£60,000
 
1.50
6/30/2015
 
3/31/2020
 
£2,035
 
1.57
9/30/2015
 
3/31/2020
 
£1,846
 
1.51
12/31/2015
 
3/31/2020
 
£1,873
 
1.48
3/31/2016
 
3/31/2020
 
£1,881
 
1.45
6/30/2016
 
3/31/2020
 
£1,909
 
1.35
9/30/2016
 
3/31/2020
 
£1,959
 
1.33
12/30/2016
 
3/31/2020
 
£1,989
 
1.28
3/31/2017
 
3/31/2020
 
£1,975
 
1.30
6/30/2017
 
3/31/2020
 
£2,026
 
1.34
10/2/2017
 
3/31/2020
 
£2,079
 
1.36
12/29/2017
 
3/31/2020
 
£2,111
 
1.39
3/29/2018
 
3/31/2020
 
£2,096
 
1.44
6/29/2018
 
3/31/2020
 
£2,151
 
1.36
9/28/2018
 
3/31/2020
 
£2,207
 
1.34