Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Adoption of New Accounting Pronouncements [Abstract]
Right-of-use asset	$ 5,785		$ 5,785
Lease liability	5,843		5,843
Revenues within scope of updated accounting guidance	$ 43,127	$ 49,443	98,145	$ 89,983
ASU 2014-09 [Member]
Adoption of New Accounting Pronouncements [Abstract]
Revenues within scope of updated accounting guidance			$ 100	$ 57
Revenues within scope of updated accounting guidance, as a percentage of total revenues (less than)			0.10%	0.10%
ASU 2016-02 [Member] | Other Assets [Member]
Adoption of New Accounting Pronouncements [Abstract]
Right-of-use asset					$ 6,088
ASU 2016-02 [Member] | Other Liabilities [Member]
Adoption of New Accounting Pronouncements [Abstract]
Lease liability					$ 6,088