Current Accounting Developments (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019		Jan. 01, 2018	[2]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets	$ 103,894
Operating lease liabilities	$ 112,142
Cumulative effect of a change in accounting principle		$ 14,668	[1]	$ (160)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of a change in accounting principle		14,668	[1]	$ (545)
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets		109,100
Operating lease liabilities		117,700
ASU 2016-02 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of a change in accounting principle		$ 14,700

[1] Represents the impact of the adoption of ASU 2016-02, Leases (Topic 842) and subsequent related ASUs in the first quarter of 2019. Refer to Note 2 — Current Accounting Developments and Note 11 — Leases to the Consolidated Financial Statements in this Form 10-Q for additional information.

[2] Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities in the first quarter of 2018.