Leases (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Leases
Rent expense	$ 15,400,000us-gaap_LeaseAndRentalExpense	$ 14,500,000us-gaap_LeaseAndRentalExpense	$ 14,900,000us-gaap_LeaseAndRentalExpense
Future minimum rental commitments for all non-cancellable operating leases
2015	10,012,000
2016	6,380,000
2017	5,163,000
2018	3,340,000
2019	1,697,000
Thereafter	1,466,000
Total	28,058,000
Capital lease obligations
Current portion of capital leases	134,000us-gaap_CapitalLeaseObligationsCurrent	257,000us-gaap_CapitalLeaseObligationsCurrent
Long-term portion of capital leases	185,000	204,000
Total capital lease obligations	319,000us-gaap_CapitalLeaseObligations	461,000us-gaap_CapitalLeaseObligations
Future minimum lease payments for all capital leases
2015	134,000
2016	98,000
2017	59,000
2018	23,000
2019	5,000
Total	$ 319,000

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737