Leases - ASC Topic 842 - (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019		Mar. 31, 2018	[2]
Leases
Lease right-of-use		$ 29,400
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Other Assets [Member]
Lease liabilities		$ 29,406
Operating Lease, Liability, Statement of Financial Position [Extensible List]		Other Liabilities [Member]
Cumulative effect of adjustment to retained earnings		$ 256	[1]	$ 26
Weighted-average remaining lease term (in years)		5 years 3 months 18 days
Weighted-average discount rate (in percent)		3.42%
Rent expense		$ 1,400
Remaining undiscounted cash flows
For the nine months ending December 31, 2019		4,295
For the year ending December 31, 2020		5,172
For the year ending December 31, 2021		4,843
For the year ending December 31, 2022		4,324
For the year ending December 31, 2023		3,921
Thereafter		16,570
Total lease payments		39,125
Less: Imputed interest		9,719
Present value of operating lease liabilities		$ 29,406
Maximum
Leases
Term of lease (in years)		9 years
Minimum
Leases
Term of lease (in years)		1 year
2016-02
Leases
Lease right-of-use	$ 30,500
Lease liabilities	30,500
Cumulative effect of adjustment to retained earnings	300
Remaining undiscounted cash flows
Present value of operating lease liabilities	$ 30,500

[1] Related to the adoption of Accounting Standards Update No. 2016-02, Leases. Refer to note 2 - Recent Accounting Pronouncements of our consolidated financial statements for further details.

[2] Related to the adoption of Accounting Standards Update No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities.