Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2013

Compensation And Retirement Disclosure [Abstract]

Contributions for Pension and Other Postretirement Benefits

Contributions were as follows:

	Six Months Ended June 30,
	2013		2012
U.S. pension benefits plan	$	0	$	0
U.K. pension benefits plan	$	870	$	888
Other postretirement benefits (e.g., net payments)	$	281	$	289
U.K. defined contribution plan	$	146	$	152

Net Periodic Pension and Other Postretirement Costs

Net periodic pension and other postretirement costs include the following components:

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
U.S. Pension Benefits
Service cost	$	1,043		$	1,151		$	2,212		$	1,972
Interest cost		2,016			2,063			4,036			4,257
Expected return on plan assets		(2,325	)		(2,395	)		(4,684	)		(4,778	)
Amortization of prior service cost		154			167			320			334
Amortization of actuarial loss		1,764			1,512			3,572			3,043
Net benefit cost	$	2,652		$	2,498		$	5,456		$	4,828
U.K. Pension Benefits
Interest cost	$	617		$	622		$	1,235		$	1,245
Expected return on plan assets		(596	)		(522	)		(1,191	)		(1,044	)
Amortization of actuarial loss		154			149			307			297
Net benefit cost	$	175		$	249		$	351		$	498
Other Postretirement Benefits
Service cost	$	271		$	162		$	472		$	323
Interest cost		255			229			463			459
Amortization of prior service cost		22			21			43			43
Amortization of actuarial loss		36			103			120			206
Net benefit cost	$	584		$	515		$	1,098		$	1,031