Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
Recent Accounting Pronouncements
Retained earnings	$ (801,999)	$ (747,749)
Accounting Standards Update 2016-16 - Intra-Entity Transfers of Assets Other Than Inventory \| Early Adoption, Effect \| Low end of range
Recent Accounting Pronouncements
Retained earnings	0
Non-current assets and Deferred tax assets	0
Accounting Standards Update 2016-16 - Intra-Entity Transfers of Assets Other Than Inventory \| Early Adoption, Effect \| High end of range
Recent Accounting Pronouncements
Retained earnings	2,500
Non-current assets and Deferred tax assets	$ 2,500

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, netted by jurisdiction and classified as noncurrent.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31917-109318

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e31931-109318

Name:	us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant