Basis of Financial Reporting - Schedule of Impact of adoption of Topic 842 on Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018
Assets:
Other current assets	$ 133,443	$ 125,712	$ 128,716
Operating lease assets	193,419	178,304	0
Total Assets	7,680,664	6,863,968	6,688,668	$ 5,802,806
Liabilities:
Accrued expenses and other liabilities	272,166	293,146	279,310
Operating lease liabilities	$ 177,097	161,464	0
Total Liabilities		3,863,400	$ 3,688,100
Accounting Standards Update 2016-02
Assets:
Other current assets		(3,004)
Operating lease assets		178,304
Total Assets		175,300
Liabilities:
Accrued expenses and other liabilities		13,836
Operating lease liabilities		161,464
Total Liabilities		$ 175,300