Debt (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 17, 2016	Sep. 24, 2015 USD ($)	Jul. 09, 2014 USD ($)
Line of Credit Facility [Line Items]
Debt Instrument, Maturity Date			Jul. 09, 2019
Debt Instrument Maturities Quarterly Repayments of Principal						$ 3,800
Revolving Credit Facility, Capacity Available for Letter of Credit	$ 40,000		$ 40,000
Loss from debt extinguishment	$ 9,827	$ 0	$ 9,827	$ 0
Eurocurrency | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)			2.00%
Eurocurrency | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)			3.50%
Base Rate | Minimum
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)			1.00%
Base Rate | Maximum
Line of Credit Facility [Line Items]
Basis spread on variable rate (as a percent)			2.50%
Four Quarters Ended June 30, 2016
Line of Credit Facility [Line Items]
Maximum cash flow leverage ratio					4.50
Minimum fixed charge coverage ratio					1.15
Four Quarters Ending September 30, 2016
Line of Credit Facility [Line Items]
Maximum cash flow leverage ratio					4.00
Minimum fixed charge coverage ratio					1.15
Four Quarters Ending December 31, 2016
Line of Credit Facility [Line Items]
Maximum cash flow leverage ratio					3.75
Minimum fixed charge coverage ratio					1.15
Four Quarters Ending March 31, 2017
Line of Credit Facility [Line Items]
Maximum cash flow leverage ratio					3.50
Four Quarters Ending June 30, 2017
Line of Credit Facility [Line Items]
Maximum cash flow leverage ratio					3.25
All Period Thereafter
Line of Credit Facility [Line Items]
Minimum fixed charge coverage ratio					1.25
Revolving credit facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity						400,000	$ 350,000
Line of Credit Facility, Current Borrowing Capacity						250,000
Term loan
Line of Credit Facility [Line Items]
Term loan						$ 300,000	$ 200,000