Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Summary of Significant Accounting Policies [Abstract]

Costs and Estimated Earnings in Excess of Billings

	As of December 31,
(in thousands)	2016		2015
Claims	$	477,425	$	407,164
Unapproved change orders		207,475		270,019
Other unbilled costs and profits		146,926		227,992
Total costs and estimated earnings in excess of billings	$	831,826	$	905,175

Calculations of Basic and Diluted EPS

	Year Ended December 31,
(in thousands, except per share data)	2016		2015		2014
Net income	$	95,822	$	45,292	$	107,936
Weighted-average common shares outstanding — basic		49,150		48,981		48,562
Effect of diluted stock options and unvested restricted stock		714		685		552
Weighted-average common shares outstanding — diluted		49,864		49,666		49,114
Net income per share:
Basic	$	1.95	$	0.92	$	2.22
Diluted	$	1.92	$	0.91	$	2.20
Anti-dilutive securities not included above		1,132		1,372		9

Cash and Cash Equivalents and Restricted Cash

	As of December 31,
(in thousands)	2016		2015
Cash and cash equivalents	$	49,539	$	18,409
Company's share of joint-venture cash and cash equivalents		96,564		57,043
Total cash and cash equivalents	$	146,103	$	75,452
Restricted cash	$	50,504	$	45,853

Tax Effects of Componenets of Other Comprehensive Income (Loss)

	Year Ended December 31,
	2016						2015						2014
(in thousands)	Before-Tax Amount		Tax Benefit		Net-of-Tax Amount		Before-Tax Amount		Tax (Expense) Benefit		Net-of-Tax Amount		Before-Tax Amount		Tax (Expense) Benefit		Net-of-Tax Amount
Other comprehensive income (loss):
Defined benefit pension plan adjustments	$	(4,452)	$	1,829	$	(2,623)	$	31	$	1,995	$	2,026	$	(13,887)	$	5,732	$	(8,155)
Foreign currency translation adjustment		(439)		178		(261)		(5,897)		2,683		(3,214)		(1,086)		448		(638)
Unrealized gain (loss) in fair value of investments		(576)		236		(340)		1,123		(357)		766		346		(141)		205
Unrealized gain (loss) in fair value of interest rate swap		(45)		21		(24)		(37)		(88)		(125)		594		(245)		349
Total other comprehensive income (loss)	$	(5,512)	$	2,264	$	(3,248)	$	(4,780)	$	4,233	$	(547)	$	(14,033)	$	5,794	$	(8,239)

Changes in AOCI Balances by Component

(in thousands)	Defined Benefit Pension Plan		Foreign Currency Translation		Unrealized Gain (Loss) in Fair Value of Investments		Unrealized Gain (Loss) in Fair Value of Interest Rate Swap		Accumulated Other Comprehensive Loss
Balance as of December 31, 2013	$	(32,113)	$	(751)	$	(315)	$	(200)	$	(33,379)
Other comprehensive income (loss)		(8,155)		(638)		205		349		(8,239)
Balance as of December 31, 2014	$	(40,268)	$	(1,389)	$	(110)	$	149	$	(41,618)
Other comprehensive income (loss)		2,026		(3,214)		766		(125)		(547)
Balance as of December 31, 2015	$	(38,242)	$	(4,603)	$	656	$	24	$	(42,165)
Other comprehensive loss before reclassifications		(3,722)		(261)		(340)		(24)		(4,347)
Amounts reclassified from AOCI		1,099		—		—		—		1,099
Balance as of December 31, 2016	$	(40,865)	$	(4,864)	$	316	$	—	$	(45,413)

Schedule Of Items Reclassified Out Of AOCI And The Corresponding Location And Impact On The Consolidated Statement Of Operations

	Location in Consolidated	Year Ended December 31,
(in thousands)	Statements of Earnings	2016		2015		2014
Component of AOCI:
Defined benefit pension plan adjustments	Various accounts	$	1,745	$	—	$	—
Income tax benefit	Provision for income taxes		(646)		—		—
Net of tax		$	1,099	$	—	$	—