Other Intangible Asset - Estimated Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Intangible Assets
Intangibles amortization	$ 10,956	$ 11,472	$ 11,401
Estimated amortization expense for the next five years
2020	10,932
2021	10,670
2022	10,520
2023	10,520
2024	$ 7,520
Weighted average remaining life for intangible assets	9 years 8 months 12 days
Amount received from settlement	$ 200		$ 1,275