Organization and Basis of Presentation - Defined Benefit Assumption and Advertising and Marketing Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expected long term rate of return for defined benefit plans
Time period for average rate of return	20 years
Percentage of greater of projected benefit obligation or fair value of plan assets for amortization of actuarial gains or losses	5.00%
Amortization period for actuarial gains and losses that exceed threshold	5 years
Advertising and marketing costs
Advertising and marketing	$ 6,910	$ 4,813	$ 6,191