Description of Business and Summary of Significant Accounting Policies Impact of Change in Accounting Policy (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Impact of adopting Topic 606 on the Company’s unaudited consolidated financial statements [Abstract]
Other current assets	$ 63,615	$ 59,274
Assets, Current	380,489	427,380
Deferred tax asset, net	59,906	54,629
Other assets	34,425	26,714
Assets	1,605,339	1,610,947
Deferred Revenue, Current	27,665	35,609
Liabilities, Current	253,832	317,428
Deferred Revenue, Noncurrent	7,662	9,051
Liabilities	1,022,023	1,066,510
Retained Earnings (Accumulated Deficit)	$ 599,148	$ 535,118