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Revenue Recognition Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue [Table Text Block]
The following table displays our revenue by major source based on product and service type for the twelve months ended December 31, 2018:

(in thousands)
 
Regulated Energy
 
Unregulated Energy
 
Other and Eliminations
 
Total
Energy distribution
 
 
 
 
 
 
 
 
Delaware natural gas division
 
$
70,338

 
$
—

 
$
—

 
$
70,338

Florida natural gas division
 
25,341

 
—

 
—

 
25,341

FPU electric distribution
 
79,803

 
—

 
—

 
79,803

FPU natural gas distribution
 
81,118

 
—

 
—

 
81,118

Maryland natural gas division
 
24,172

 
—

 
—

 
24,172

Sandpiper natural gas/propane operations
 
22,088

 
—

 
—

 
22,088

Total energy distribution
 
302,860

 
—

 
—

 
302,860

 
 
 
 
 
 
 
 
 
Energy transmission
 
 
 
 
 
 
 
 
Aspire Energy
 
—

 
35,407

 
—

 
35,407

Eastern Shore
 
64,248

 
—

 
—

 
64,248

Peninsula Pipeline
 
11,927

 
—

 
—

 
11,927

Total energy transmission
 
76,175

 
35,407

 
—

 
111,582

 
 
 
 
 
 
 
 
 
Energy generation
 
 
 
 
 
 
 
 
Eight Flags
 
—

 
17,302

 
—

 
17,302

 
 
 
 
 
 
 
 
 
Propane operations
 
 
 
 
 
 
 
 
Mid-Atlantic propane operations
 
—

 
102,321

 
—

 
102,321

Florida propane operations
 
—

 
21,282

 
—

 
21,282

Total propane operations
 
—

 
123,603

 
—

 
123,603

 
 
 
 
 
 
 
 
 
Energy services
 
 
 
 
 
 
 
 
Marlin Gas Services
 
—

 
121

 
—

 
121

PESCO - Natural Gas Marketing
 
—

 
258,713

 
—

 
258,713

 
 
—

 
258,834

 
—

 
258,834

 
 
 
 
 
 
 
 
 
Other and eliminations
 
 
 
 
 
 
 
 
Eliminations
 
(33,754
)
 
(16,486
)
 
(49,062
)
 
(99,302
)
Other
 
—

 
1,957

 
653

 
2,610

Total other and eliminations
 
(33,754
)
 
(14,529
)
 
(48,409
)
 
(96,692
)
 
 
 
 
 
 
 
 
 
Total operating revenues (1)
 
$
345,281

 
$
420,617

 
$
(48,409
)
 
$
717,489

(1) Includes other revenue (revenues from sources other than contracts with customers) of $236,000 and $334,000 for our Regulated and Unregulated Energy segments, respectively. The sources of other revenues include revenue from alternative revenue programs related to revenue normalization for Maryland division and Sandpiper and late fees.
Contract with Customer, Asset and Liability [Table Text Block]
The balances of our trade receivables, contract assets, and contract liabilities as of December 31, 2018 and 2017 were as follows:
 
 
 
 
 
 
 
 
 
Trade Receivables
 
Contract Assets (Non-current)
 
Contract Liabilities (Current)
(in thousands)
 
 
 
 
 
 
Balance at 12/31/2017
 
$
74,962

 
$
1,270

 
$
407

Balance at 12/31/2018
 
83,214

 
2,614

 
480

Increase (decrease)
 
$
8,252

 
$
1,344

 
$
73
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
Revenue for these businesses for the remaining performance obligations at December 31, 2018 are expected to be recognized as follows:
(in thousands)
2019
 
2020
 
2021
 
2022
 
2023
 
2024 and thereafter
Eastern Shore and Peninsula Pipeline
$
38,505

 
$
36,768

 
$
33,510

 
$
26,566

 
$
21,146

 
$
212,620

Natural gas distribution operations
4,109

 
3,586

 
3,358

 
3,320

 
2,924

 
30,826

PESCO - Natural Gas Marketing
8,886

 
4,702

 
1,728

 
23

 
—

 
—

FPU electric distribution
297

 
297

 
297

 
109

 
—

 
—

Total revenue contracts with remaining performance obligations
$
51,797

 
$
45,353

 
$
38,893

 
$
30,018

 
$
24,070

 
$
243,446