New Accounting Standards Adjustment for new accounting pronouncement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payments for retirement of debt	$ 0	$ 7,030	$ 757
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Finance Costs, Net		8,800
Payments for retirement of debt		$ 7,000	$ 800