Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Fair Value Measured On Recurring Basis (Details)

v3.7.0.1
Fair Value Measurements - Schedule of Fair Value Measured On Recurring Basis (Details) - Recurring - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair value measurements    
Interest rate swap agreement - assets [1] $ 8,124 $ 8,521
Interest rate swap agreements - liabilities [2] (15,488) (16,948)
Total (7,364) (8,427)
Level 1    
Fair value measurements    
Interest rate swap agreement - assets [1] 0 0
Interest rate swap agreements - liabilities [2] 0 0
Total 0 0
Level 2    
Fair value measurements    
Interest rate swap agreement - assets [1] 8,124 8,521
Interest rate swap agreements - liabilities [2] (15,488) (16,948)
Total (7,364) (8,427)
Level 3    
Fair value measurements    
Interest rate swap agreement - assets [1] 0 0
Interest rate swap agreements - liabilities [2] 0 0
Total $ 0 $ 0
[1] Included in Other assets on the consolidated balance sheets
[2] Interest rate swap agreement liability values are included in current Other accrued liabilities or non-current Derivative financial instruments on the consolidated balance sheets depending on the maturity date of the swap.