Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net	$ 110,478	$ 85,319	$ 83,518
Prepaid expenses and other assets	25,856	24,151	22,596
Accrued expenses and other liabilities	99,793	87,802	84,446
Balances Before Adoption of ASC 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net	106,091		83,518
Prepaid expenses and other assets	22,982		22,596
Accrued expenses and other liabilities	92,532		$ 84,446
ASU 2014-09 [Member] | Impact of Adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net	4,387	1,801
Prepaid expenses and other assets	2,874	1,555
Accrued expenses and other liabilities	$ 7,261	$ 3,356