Summary of Significant Accounting Policies - New Accounting Pronouncement (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Share-based compensation, excess tax benefit	$ 200,000
Prepaid Expenses, Other Assets and Long Term Debt, Current [Member] | Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Finance Costs, Net		$ 93,000
Other Assets and Long Term Debt, Noncurrent [Member] | Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred Finance Costs, Net		$ 72,000