Derivative Instruments Fair values of the Company's interest rate swaps, exclusive of accrued interest (Details) - Interest rate swaps - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Designated as Hedging Instrument [Member] \| Prepaid expenses and other current assets
Derivative [Line Items]
Fair value of the company's interest rate swaps, exclusive of accrued interest	$ 0	$ 19
Designated as Hedging Instrument [Member] \| Other assets, net
Derivative [Line Items]
Fair value of the company's interest rate swaps, exclusive of accrued interest	0	10,661
Designated as Hedging Instrument [Member] \| Other accrued liabilities
Derivative [Line Items]
Other accrued liabilities	0	8
Not Designated as Hedging Instrument [Member] \| Prepaid expenses and other current assets
Derivative [Line Items]
Fair value of the company's interest rate swaps, exclusive of accrued interest	61	0
Not Designated as Hedging Instrument [Member] \| Other assets, net
Derivative [Line Items]
Fair value of the company's interest rate swaps, exclusive of accrued interest	$ 11,868	$ 0

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313

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