Fair Value Measurements (Details) - Recurring Measurement - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 3,751	$ 4,587
Interest rate cap hedges	553	963
Total Assets	4,304	5,550
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	3,751	4,587
Interest rate cap hedges	0	0
Total Assets	3,751	4,587
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Interest rate cap hedges	553	963
Total Assets	553	963
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Interest rate cap hedges	0	0
Total Assets	$ 0	$ 0