Credit Agreements (Details)	3 Months Ended	6 Months Ended				6 Months Ended		6 Months Ended			1 Months Ended	6 Months Ended
	Dec. 31, 2012 USD ($)	Dec. 31, 2013 USD ($)	Jun. 30, 2013 USD ($)	May 31, 2013	Mar. 22, 2013	Dec. 31, 2013 JP Morgan [Member] USD ($)	Jun. 30, 2013 JP Morgan [Member] USD ($)	Dec. 31, 2013 JP Morgan UK [Member] USD ($)	Dec. 31, 2013 RBSNederlandNV [Member] EUR (€)	Dec. 31, 2013 Interest Rate Cap [Member] USD ($)	May 31, 2013 Interest Rate Swap [Member] USD ($)	Dec. 31, 2013 Interest Rate Swap [Member] USD ($)	Dec. 31, 2013 Senior Notes due in 2020 [Member] USD ($)	Mar. 22, 2013 2013 Credit Agreement LIBOR [Member]	Dec. 31, 2013 2013 Credit Agreement [Member] USD ($)	Mar. 22, 2013 Swingline Loan [Member] USD ($)	Dec. 31, 2013 Revolving Credit Facility [Member] USD ($)	Mar. 22, 2013 Revolving Credit Facility [Member] USD ($)	Mar. 22, 2013 2013 Credit Agreement Federal Funds Rate [Member]	Mar. 22, 2013 2013 Credit Agreement One Month LIBOR [Member]	Mar. 22, 2013 2013 Credit Agreement One Month LIBOR Margin [Member]	Mar. 22, 2013 2013 Credit Agreement Swingline [Member]	Dec. 31, 2013 Term Loan [Member] USD ($)	Mar. 22, 2013 Term Loan [Member] USD ($)	Dec. 31, 2013 Senior Notes due in 2020 [Member] Senior Notes [Member] USD ($)	Jul. 25, 2013 Senior Notes due in 2020 [Member] Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Interest Rate, Stated Percentage																										3.11%
Derivative, Notional Amount		$ 551,899,000	$ 509,947,000
Deferred Finance Costs, Noncurrent, Net													400,000		3,100,000
Long-term Debt																								200,000,000
Debt Instrument, Face Amount																		200,000,000
Proceeds from Issuance of Long-term Debt	107,500,000
Line of Credit Facility, Current Borrowing Capacity																75,000,000		300,000,000
Letters of Credit Outstanding, Amount		10,200,000																10,000,000
Debt Instrument, Basis Spread on Variable Rate														1.75%					0.50%	1.00%	0.75%	0.75%
Term Loan, Quarterly Principal Payment Percentage,year one and two					1.25%
Term Loan, Quarterly Principal Payment Percentage,year three					2.50%
Term Loan, Quarterly Principal Payment Percentage,year four					5.00%
Term Loan, Quarterly Principal Payment Percentage,year five					7.50%
Term Loan, Quarterly Principal Payment Percentage,maturity date					37.50%
Credit agreement maximum borrowing capacity								4,500,000	5,000,000
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum								2.00%	2.00%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum								4.00%	4.00%
Line of credit facility amount outstanding																	90,000,000
Long-term Debt, Gross		386,468,000																					192,500,000		100,000,000
Max commitment fee on revolving loan unused amount, percentage		0.35%
Remaining borrowing available under revolving credit facility								4,500,000	5,000,000								210,000,000
Interest rate swap, fixed interest rate		1.30%		0.73%
Notional Amount of Interest Rate Derivatives		200,000,000
Derivative interest rate cap arrangement		2.00%
Principal amount of debt hedged with an interest rate swap agreement										25,000,000	100,000,000	100,000,000
Debt, Weighted Average Interest Rate															0.00%
Transfers of Financial Assets Including Debt Activity						70,200,000
Other Short-term Borrowings						$ 4,000,000	$ 10,400,000