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Adoption of Accounting Pronouncements Adoption of Accounting Pronouncements (Tables)
 12 Months Ended
Dec. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
 
 
December 31, 2017
December 31, 2016
($ in thousands)
 
Prior to Adoption
 
After Adoption
Prior to Adoption
 
After Adoption
Undistributed (gains) losses of equity method investments
 
$
(6,393
)
 
(5,362
)
$
(2,316
)
 
318

Distributions in excess of current year income of equity method investments
 
—

 
552

—

 
—

(Increase) decrease in other assets
 
(9,872
)
 
(2,643
)
(30,071
)
 
(4,979
)
Net cash provided by operating activities
 
370,733

 
379,545

301,783

 
329,509

 
 
 
 
 
 
 
 
Distributions from other investments
 
23,426

 
21,843

26,837

 
24,202

Net cash used in investing activities
 
(331,075
)
 
(332,658
)
(318,101
)
 
(320,736
)