Fair Value Measurements - Reconciliation of Recurring Financial Liability Related to Interest Rate Swaps (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Cost of Hedge Net of Cash Received	$ (157)
Derivative, Cash Received on Hedge		$ 54
Interest rate swap | Designated As Hedging | Cash Flow Hedge
Reconciliation of the recurring financial derivatives
Beginning balance, derivative liability	753	(768)
Total gains/(losses) for the period:
Included in earnings	0		$ 928
Included in other comprehensive income	69		593
Ending balance, derivative liability	822	753	(768)
Foreign currency hedges | Designated As Hedging | Cash Flow Hedge
Reconciliation of the recurring financial derivatives
Beginning balance, derivative liability	(601)	0
Total gains/(losses) for the period:
Included in earnings	157	(18)
Included in other comprehensive income	1,123	(637)
Ending balance, derivative liability		$ (601)	$ 0
Ending balance, derivative asset	$ 522