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Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		$ 27,356	$ 7,020	$ 57,225	$ 30,890	$ 9,615	$ 43,833
Accumulated other comprehensive loss		$ (22,261)		(21,791)	$ (18,921)
ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Pre-tax impact to retained earnings	$ 4,378
Cumulative impact to retained earnings	$ 3,319
ASU 2018-02 \| New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings				(593)
Accumulated other comprehensive loss				$ 593