Significant Accounting Policies (Recently Issued Accounting Standards) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to Tax Cuts and Jobs Act of 2017		$ 160
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contract liability	$ 2,600
Reclassification within Consolidated Balance Sheet	(1,963)
Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification within Consolidated Balance Sheet	0
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to Tax Cuts and Jobs Act of 2017		$ 2,891
Retained Earnings | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings, tax	600
Reclassification within Consolidated Balance Sheet	(1,963)
Retained Earnings | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification within Consolidated Balance Sheet	2,727
Subsequent Event | Forecast | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Approximate increase to assets upon adoption of ASU 2016-02			$ 13,000
Approximate increase to liabilities upon adoption of ASU 2016-02			$ 13,000
Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to Tax Cuts and Jobs Act of 2017	$ 2,900