Debt Schedule of Long-Term Debt Repayments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 79,119	$ 62,998	$ 102,438
Line of Credit [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	67,869	49,873	76,188
USD Denominated Term Loan [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	11,250	13,125	26,250
Secured Debt [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt	$ 79,119	$ 62,998	$ 102,438