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Adoption of Accounting Pronouncements Adoption of Accounting Pronouncements (Tables) | 12 Months Ended
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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 | )

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