Fair Value Disclosures (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014		Dec. 31, 2013
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restructuring Charges		$ 566		$ 0	$ 613		$ 72
Fair value of assets		7,865	[1]		7,865	[1]		$ 8,786	[2]
Prepaid Expenses and Other Current Assets [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Deferred compensation plan assets		900			900			700
Other Non-Current Assets [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Deferred compensation plan assets	[1]	7,000			7,000			8,100
Bond Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		1,765			1,765			1,879
Large Cap Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		2,368			2,368			2,852
International Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		1,361			1,361			1,405
Mid Cap Mutual Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		514			514			606
Small Cap Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		418			418			470
Balanced Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		433			433			339
Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		1,006			1,006			1,235
Level 1 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		7,865	[1]		7,865	[1]		8,786	[2]
Level 1 [Member] | Bond Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		1,765			1,765			1,879
Level 1 [Member] | Large Cap Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		2,368			2,368			2,852
Level 1 [Member] | International Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		1,361			1,361			1,405
Level 1 [Member] | Mid Cap Mutual Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		514			514			606
Level 1 [Member] | Small Cap Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		418			418			470
Level 1 [Member] | Balanced Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		433			433			339
Level 1 [Member] | Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		1,006			1,006			1,235
Level 2 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0	[1]		0	[1]		0	[2]
Level 2 [Member] | Bond Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 2 [Member] | Large Cap Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 2 [Member] | International Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 2 [Member] | Mid Cap Mutual Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 2 [Member] | Small Cap Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 2 [Member] | Balanced Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 2 [Member] | Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 3 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0	[1]		0	[1]		0	[2]
Level 3 [Member] | Bond Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 3 [Member] | Large Cap Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 3 [Member] | International Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 3 [Member] | Mid Cap Mutual Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 3 [Member] | Small Cap Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 3 [Member] | Balanced Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Level 3 [Member] | Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets		0			0			0
Employee Severance [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restructuring Reserve								2,031
Restructuring Charges					0		37
Restructuring Reserve, Settled without Cash					0		0
Restructuring Reserve, Accrual Adjustment					(30)		729
Employee Severance [Member] | Accrued Liabilities [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restructuring Reserve		546		1,226	546		1,226			$ 4,568
Payments for Restructuring					(1,455)		(2,650)
Real estate exit and related costs
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restructuring Reserve								2,600
Restructuring Charges					599		734
Restructuring Reserve, Settled without Cash					0		0
Restructuring Reserve, Accrual Adjustment					30
Real estate exit and related costs | Accrued Liabilities [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restructuring Reserve		2,169		1,018	2,169		1,018			769
Payments for Restructuring					(1,060)		(485)
Asset Write-offs [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restructuring Reserve								0
Restructuring Charges					14		30
Restructuring Reserve, Settled without Cash					(14)		(30)
Restructuring Reserve, Accrual Adjustment					0
Accrued restructuring liability
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restructuring Reserve								$ 4,631
Accrued restructuring liability | Accrued Liabilities [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Restructuring Reserve		$ 2,715		$ 2,244	$ 2,715		$ 2,244			$ 5,337

[1] As of September 30, 2015, $0.9 million and $7.0 million are included in “Prepaid expenses and other current assets” (liability offset in “Other accrued expenses and other current liabilities”) and “Other non-current assets” (liability offset in “Deferred compensation”), respectively, in the consolidated balance sheets reflecting the non-qualified Deferred Compensation Plan assets.

[2] (1) As of December 31, 2014, $0.7 million and $8.1 million are included in “Prepaid expenses and other current assets” (liability offset in “Other accrued expenses and other current liabilities”) and “Other non-current assets” (liability offset in “Deferred compensation”), respectively, in the consolidated balance sheets reflecting the non-qualified Deferred Compensation Plan assets.