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Recent Authoritative Guidance - ASU 2016-18 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net cash used in investing activities $ (57,748) $ (46,902)
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents 50,360 (10,348)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period 152,202 [1] 69,571
Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period 202,562 [2] 59,223
Accounting Standards Update 2016-18    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Transfer of cash from restricted accounts, net   0
Net cash used in investing activities   (46,902)
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents   (10,348)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period   69,571
Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period   59,223
AS REPORTED | Accounting Standards Update 2016-18    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Transfer of cash from restricted accounts, net   8,790
Net cash used in investing activities   (38,112)
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents   (1,558)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period   23,077
Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period   21,519
Cleco Power    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net cash used in investing activities (59,733) (45,552)
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents 51,258 (9,108)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period 102,957 [3] 67,955
Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period $ 154,215 [4] 58,847
Cleco Power | Accounting Standards Update 2016-18    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Transfer of cash from restricted accounts, net   0
Net cash used in investing activities   (45,552)
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents   (9,108)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period   67,955
Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period   58,847
Cleco Power | AS REPORTED | Accounting Standards Update 2016-18    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Transfer of cash from restricted accounts, net   8,790
Net cash used in investing activities   (36,762)
Net decrease in cash, cash equivalents, restricted cash, and restricted cash equivalents   (318)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of period   21,482
Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of period   $ 21,164
[1] Includes cash and cash equivalents are $119,040, current restricted cash and cash equivalents are $13,081, non-current restricted cash and cash equivalents are $20,081.
[2] Includes cash and cash equivalents are $176,508, current restricted cash and cash equivalents are $6,727, non-current restricted cash and cash equivalents are $19,327.
[3] Includes cash and cash equivalents are $69,816, current restricted cash and cash equivalents are $13,081, non-current restricted cash and cash equivalents are $20,060.
[4] Includes cash and cash equivalents are $128,182, current restricted cash and cash equivalents are $6,727, non-current restricted cash and cash equivalents are $19,306.