Significant Accounting Policies (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018	Jan. 01, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets		$ 46,747
Present value of lease liabilities		46,188
Provisions for Bad Debt		$ 147,639		$ 156,732
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets			$ 51,600
Subsequent Event | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss	$ 3,100
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in retained earnings			$ 0		$ (1,573)	$ 4,882
Retained Earnings | Subsequent Event | Accounting Standards Update 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in retained earnings	$ 1,600